diff --git a/cards/.classpath b/cards/.classpath
index 8b3d57e2bb6041045f04aac1d26efdcbf2fd6c5b..5b2acc5be1acb42a991df32566cf5ed17416819b 100644
--- a/cards/.classpath
+++ b/cards/.classpath
@@ -6,12 +6,6 @@
 			<attribute name="gradle_used_by_scope" value="main,test"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="src" output="bin/main" path="src/main/resources">
-		<attributes>
-			<attribute name="gradle_scope" value="main"/>
-			<attribute name="gradle_used_by_scope" value="main,test"/>
-		</attributes>
-	</classpathentry>
 	<classpathentry kind="src" output="bin/test" path="src/test/java">
 		<attributes>
 			<attribute name="gradle_scope" value="test"/>
@@ -19,14 +13,7 @@
 			<attribute name="test" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="src" output="bin/test" path="src/test/resources">
-		<attributes>
-			<attribute name="gradle_scope" value="test"/>
-			<attribute name="gradle_used_by_scope" value="test"/>
-			<attribute name="test" value="true"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8/"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-13/"/>
 	<classpathentry kind="con" path="org.eclipse.buildship.core.gradleclasspathcontainer"/>
 	<classpathentry kind="output" path="bin/default"/>
 </classpath>
diff --git a/cards/.gitattributes b/cards/.gitattributes
new file mode 100644
index 0000000000000000000000000000000000000000..00a51aff5e5a83d6313f3bd15fadc601a205b66f
--- /dev/null
+++ b/cards/.gitattributes
@@ -0,0 +1,6 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# These are explicitly windows files and should use crlf
+*.bat           text eol=crlf
+
diff --git a/cards/.gitignore b/cards/.gitignore
index 1b6985c0094c8e3db5f1c6e2c4d66b82f325284f..f198ec547b9190a094cdd1e56458a0ed7b8c23c8 100644
--- a/cards/.gitignore
+++ b/cards/.gitignore
@@ -1,5 +1,216 @@
-# Ignore Gradle project-specific cache directory
+# Created by https://www.gitignore.io/api/java,gradle,eclipse,intellij,visualstudiocode
+# Edit at https://www.gitignore.io/?templates=java,gradle,eclipse,intellij,visualstudiocode
+
+### Eclipse ###
+.metadata
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
+.recommenders
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# PyDev specific (Python IDE for Eclipse)
+*.pydevproject
+
+# CDT-specific (C/C++ Development Tooling)
+.cproject
+
+# CDT- autotools
+.autotools
+
+# Java annotation processor (APT)
+.factorypath
+
+# PDT-specific (PHP Development Tools)
+.buildpath
+
+# sbteclipse plugin
+.target
+
+# Tern plugin
+.tern-project
+
+# TeXlipse plugin
+.texlipse
+
+# STS (Spring Tool Suite)
+.springBeans
+
+# Code Recommenders
+.recommenders/
+
+# Annotation Processing
+.apt_generated/
+
+# Scala IDE specific (Scala & Java development for Eclipse)
+.cache-main
+.scala_dependencies
+.worksheet
+
+### Eclipse Patch ###
+# Eclipse Core
+.project
+
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+# Annotation Processing
+.apt_generated
+
+.sts4-cache/
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+# .idea/misc.xml
+# *.ipr
+
+# Sonarlint plugin
+.idea/**/sonarlint/
+
+# SonarQube Plugin
+.idea/**/sonarIssues.xml
+
+# Markdown Navigator plugin
+.idea/**/markdown-navigator.xml
+.idea/**/markdown-navigator/
+
+### Java ###
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+
+### Gradle ###
 .gradle
+build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Cache of project
+.gradletasknamecache
+
+# # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
+# gradle/wrapper/gradle-wrapper.properties
+
+### Gradle Patch ###
+**/build/
 
-# Ignore Gradle build output directory
-build
+# End of https://www.gitignore.io/api/java,gradle,eclipse,intellij,visualstudiocode
\ No newline at end of file
diff --git a/cards/.project b/cards/.project
deleted file mode 100644
index 4e680e5ce8911eb6de9d74267b0c658e91a33b9c..0000000000000000000000000000000000000000
--- a/cards/.project
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>cards</name>
-	<comment>Project cards created by Buildship.</comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
-	</natures>
-</projectDescription>
diff --git a/cards/.settings/org.eclipse.buildship.core.prefs b/cards/.settings/org.eclipse.buildship.core.prefs
deleted file mode 100644
index e8895216fd3c0c3af4c4522334775f41b7deb42e..0000000000000000000000000000000000000000
--- a/cards/.settings/org.eclipse.buildship.core.prefs
+++ /dev/null
@@ -1,2 +0,0 @@
-connection.project.dir=
-eclipse.preferences.version=1
diff --git a/cards/bin/main/io/fp/cards/App.class b/cards/bin/main/io/fp/cards/App.class
deleted file mode 100644
index 561ee6f562f3302e14b018bf45ef553048b9d9c3..0000000000000000000000000000000000000000
Binary files a/cards/bin/main/io/fp/cards/App.class and /dev/null differ
diff --git a/cards/build.gradle b/cards/build.gradle
index a9eafd8c630170917d8c31778b1d7aada4bcca2a..186783bae21680ed8abda7e59b7ddc9992ae451c 100644
--- a/cards/build.gradle
+++ b/cards/build.gradle
@@ -3,14 +3,14 @@
  *
  * This generated file contains a sample Java project to get you started.
  * For more details take a look at the Java Quickstart chapter in the Gradle
- * User Manual available at https://docs.gradle.org/5.6.1/userguide/tutorial_java_projects.html
+ * User Manual available at https://docs.gradle.org/6.3/userguide/tutorial_java_projects.html
  */
 
 plugins {
     // Apply the java plugin to add support for Java
     id 'java'
 
-    // Apply the application plugin to add support for building a CLI application
+    // Apply the application plugin to add support for building a CLI application.
     id 'application'
 }
 
@@ -22,18 +22,18 @@ repositories {
 
 dependencies {
     // This dependency is used by the application.
-    implementation 'com.google.guava:guava:28.0-jre'
+    implementation 'com.google.guava:guava:28.2-jre'
 
     // Use JUnit Jupiter API for testing.
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.4.2'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
 
     // Use JUnit Jupiter Engine for testing.
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.4.2'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.6.0'
 }
 
 application {
-    // Define the main class for the application
-    mainClassName = 'io.fp.cards.App'
+    // Define the main class for the application.
+    mainClassName = 'io.fp.shoes.App'
 }
 
 test {
diff --git a/cards/gradle/wrapper/gradle-wrapper.jar b/cards/gradle/wrapper/gradle-wrapper.jar
index 5c2d1cf016b3885f6930543d57b744ea8c220a1a..490fda8577df6c95960ba7077c43220e5bb2c0d9 100644
Binary files a/cards/gradle/wrapper/gradle-wrapper.jar and b/cards/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/cards/gradle/wrapper/gradle-wrapper.properties b/cards/gradle/wrapper/gradle-wrapper.properties
index 59b5f89288842bf8ef144d802e597dcf482b3d70..a4b4429748d92848a3d820c7b099fbeb941066ae 100644
--- a/cards/gradle/wrapper/gradle-wrapper.properties
+++ b/cards/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/cards/gradlew b/cards/gradlew
index 83f2acfdc319a24e8766cca78f32474ad7a22dd6..2fe81a7d95e4f9ad2c9b2a046707d36ceb3980b3 100644
--- a/cards/gradlew
+++ b/cards/gradlew
@@ -154,19 +154,19 @@ if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
         else
             eval `echo args$i`="\"$arg\""
         fi
-        i=$((i+1))
+        i=`expr $i + 1`
     done
     case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
     esac
 fi
 
@@ -175,14 +175,9 @@ save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
-APP_ARGS=$(save "$@")
+APP_ARGS=`save "$@"`
 
 # Collect all arguments for the java command, following the shell quoting and substitution rules
 eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
-fi
-
 exec "$JAVACMD" "$@"
diff --git a/cards/gradlew.bat b/cards/gradlew.bat
index 9618d8d9607cd91a0efb866bcac4810064ba6fac..62bd9b9ccefea2b65ae41e5d9a545e2021b90a1d 100644
--- a/cards/gradlew.bat
+++ b/cards/gradlew.bat
@@ -29,6 +29,9 @@ if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
diff --git a/cards/settings.gradle b/cards/settings.gradle
index cf9931ff0988759a0386907b8577c5e766d799c0..43621cc760e4afdf4cb9308dd5ac963f116b471d 100644
--- a/cards/settings.gradle
+++ b/cards/settings.gradle
@@ -4,7 +4,7 @@
  * The settings file is used to specify which projects to include in your build.
  *
  * Detailed information about configuring a multi-project build in Gradle can be found
- * in the user manual at https://docs.gradle.org/5.6.1/userguide/multi_project_builds.html
+ * in the user manual at https://docs.gradle.org/6.3/userguide/multi_project_builds.html
  */
 
-rootProject.name = 'cards'
+rootProject.name = 'campus'
diff --git a/duplicates/.classpath b/duplicates/.classpath
deleted file mode 100644
index 8b3d57e2bb6041045f04aac1d26efdcbf2fd6c5b..0000000000000000000000000000000000000000
--- a/duplicates/.classpath
+++ /dev/null
@@ -1,32 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="src" output="bin/main" path="src/main/java">
-		<attributes>
-			<attribute name="gradle_scope" value="main"/>
-			<attribute name="gradle_used_by_scope" value="main,test"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="src" output="bin/main" path="src/main/resources">
-		<attributes>
-			<attribute name="gradle_scope" value="main"/>
-			<attribute name="gradle_used_by_scope" value="main,test"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="src" output="bin/test" path="src/test/java">
-		<attributes>
-			<attribute name="gradle_scope" value="test"/>
-			<attribute name="gradle_used_by_scope" value="test"/>
-			<attribute name="test" value="true"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="src" output="bin/test" path="src/test/resources">
-		<attributes>
-			<attribute name="gradle_scope" value="test"/>
-			<attribute name="gradle_used_by_scope" value="test"/>
-			<attribute name="test" value="true"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8/"/>
-	<classpathentry kind="con" path="org.eclipse.buildship.core.gradleclasspathcontainer"/>
-	<classpathentry kind="output" path="bin/default"/>
-</classpath>
diff --git a/duplicates/.gitattributes b/duplicates/.gitattributes
new file mode 100644
index 0000000000000000000000000000000000000000..00a51aff5e5a83d6313f3bd15fadc601a205b66f
--- /dev/null
+++ b/duplicates/.gitattributes
@@ -0,0 +1,6 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# These are explicitly windows files and should use crlf
+*.bat           text eol=crlf
+
diff --git a/duplicates/.gitignore b/duplicates/.gitignore
index 1b6985c0094c8e3db5f1c6e2c4d66b82f325284f..f198ec547b9190a094cdd1e56458a0ed7b8c23c8 100644
--- a/duplicates/.gitignore
+++ b/duplicates/.gitignore
@@ -1,5 +1,216 @@
-# Ignore Gradle project-specific cache directory
+# Created by https://www.gitignore.io/api/java,gradle,eclipse,intellij,visualstudiocode
+# Edit at https://www.gitignore.io/?templates=java,gradle,eclipse,intellij,visualstudiocode
+
+### Eclipse ###
+.metadata
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
+.recommenders
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# PyDev specific (Python IDE for Eclipse)
+*.pydevproject
+
+# CDT-specific (C/C++ Development Tooling)
+.cproject
+
+# CDT- autotools
+.autotools
+
+# Java annotation processor (APT)
+.factorypath
+
+# PDT-specific (PHP Development Tools)
+.buildpath
+
+# sbteclipse plugin
+.target
+
+# Tern plugin
+.tern-project
+
+# TeXlipse plugin
+.texlipse
+
+# STS (Spring Tool Suite)
+.springBeans
+
+# Code Recommenders
+.recommenders/
+
+# Annotation Processing
+.apt_generated/
+
+# Scala IDE specific (Scala & Java development for Eclipse)
+.cache-main
+.scala_dependencies
+.worksheet
+
+### Eclipse Patch ###
+# Eclipse Core
+.project
+
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+# Annotation Processing
+.apt_generated
+
+.sts4-cache/
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+# .idea/misc.xml
+# *.ipr
+
+# Sonarlint plugin
+.idea/**/sonarlint/
+
+# SonarQube Plugin
+.idea/**/sonarIssues.xml
+
+# Markdown Navigator plugin
+.idea/**/markdown-navigator.xml
+.idea/**/markdown-navigator/
+
+### Java ###
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+
+### Gradle ###
 .gradle
+build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Cache of project
+.gradletasknamecache
+
+# # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
+# gradle/wrapper/gradle-wrapper.properties
+
+### Gradle Patch ###
+**/build/
 
-# Ignore Gradle build output directory
-build
+# End of https://www.gitignore.io/api/java,gradle,eclipse,intellij,visualstudiocode
\ No newline at end of file
diff --git a/duplicates/.project b/duplicates/.project
deleted file mode 100644
index 2cac221094ab3c2988af3913a04b35a108fba0ae..0000000000000000000000000000000000000000
--- a/duplicates/.project
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>duplicates</name>
-	<comment>Project duplicates created by Buildship.</comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
-	</natures>
-</projectDescription>
diff --git a/duplicates/.settings/org.eclipse.buildship.core.prefs b/duplicates/.settings/org.eclipse.buildship.core.prefs
deleted file mode 100644
index e8895216fd3c0c3af4c4522334775f41b7deb42e..0000000000000000000000000000000000000000
--- a/duplicates/.settings/org.eclipse.buildship.core.prefs
+++ /dev/null
@@ -1,2 +0,0 @@
-connection.project.dir=
-eclipse.preferences.version=1
diff --git a/duplicates/bin/main/io/fp/duplicates/App.class b/duplicates/bin/main/io/fp/duplicates/App.class
deleted file mode 100644
index de5e5d86db9d62ce6234260f2632090b90646e9d..0000000000000000000000000000000000000000
Binary files a/duplicates/bin/main/io/fp/duplicates/App.class and /dev/null differ
diff --git a/duplicates/build.gradle b/duplicates/build.gradle
index 1b81c01b34d10939494ebc2efe5bf7c6fb9acc91..cbc8bce4daa229bd1060eba80e4dbd6d895e252a 100644
--- a/duplicates/build.gradle
+++ b/duplicates/build.gradle
@@ -3,14 +3,14 @@
  *
  * This generated file contains a sample Java project to get you started.
  * For more details take a look at the Java Quickstart chapter in the Gradle
- * User Manual available at https://docs.gradle.org/5.6.1/userguide/tutorial_java_projects.html
+ * User Manual available at https://docs.gradle.org/6.3/userguide/tutorial_java_projects.html
  */
 
 plugins {
     // Apply the java plugin to add support for Java
     id 'java'
 
-    // Apply the application plugin to add support for building a CLI application
+    // Apply the application plugin to add support for building a CLI application.
     id 'application'
 }
 
@@ -22,17 +22,17 @@ repositories {
 
 dependencies {
     // This dependency is used by the application.
-    implementation 'com.google.guava:guava:28.0-jre'
+    implementation 'com.google.guava:guava:28.2-jre'
 
     // Use JUnit Jupiter API for testing.
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.4.2'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
 
     // Use JUnit Jupiter Engine for testing.
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.4.2'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.6.0'
 }
 
 application {
-    // Define the main class for the application
+    // Define the main class for the application.
     mainClassName = 'io.fp.duplicates.App'
 }
 
diff --git a/duplicates/gradle/wrapper/gradle-wrapper.jar b/duplicates/gradle/wrapper/gradle-wrapper.jar
index 5c2d1cf016b3885f6930543d57b744ea8c220a1a..490fda8577df6c95960ba7077c43220e5bb2c0d9 100644
Binary files a/duplicates/gradle/wrapper/gradle-wrapper.jar and b/duplicates/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/duplicates/gradle/wrapper/gradle-wrapper.properties b/duplicates/gradle/wrapper/gradle-wrapper.properties
index 59b5f89288842bf8ef144d802e597dcf482b3d70..a4b4429748d92848a3d820c7b099fbeb941066ae 100644
--- a/duplicates/gradle/wrapper/gradle-wrapper.properties
+++ b/duplicates/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/duplicates/gradlew b/duplicates/gradlew
index 83f2acfdc319a24e8766cca78f32474ad7a22dd6..2fe81a7d95e4f9ad2c9b2a046707d36ceb3980b3 100644
--- a/duplicates/gradlew
+++ b/duplicates/gradlew
@@ -154,19 +154,19 @@ if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
         else
             eval `echo args$i`="\"$arg\""
         fi
-        i=$((i+1))
+        i=`expr $i + 1`
     done
     case $i in
-        (0) set -- ;;
-        (1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
     esac
 fi
 
@@ -175,14 +175,9 @@ save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
-APP_ARGS=$(save "$@")
+APP_ARGS=`save "$@"`
 
 # Collect all arguments for the java command, following the shell quoting and substitution rules
 eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
 
-# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
-if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
-  cd "$(dirname "$0")"
-fi
-
 exec "$JAVACMD" "$@"
diff --git a/duplicates/gradlew.bat b/duplicates/gradlew.bat
index 9618d8d9607cd91a0efb866bcac4810064ba6fac..62bd9b9ccefea2b65ae41e5d9a545e2021b90a1d 100644
--- a/duplicates/gradlew.bat
+++ b/duplicates/gradlew.bat
@@ -29,6 +29,9 @@ if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
 @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
 
diff --git a/duplicates/settings.gradle b/duplicates/settings.gradle
index 427b4a9cfe290087783b3f8a6f3d9c7d025d38e9..43621cc760e4afdf4cb9308dd5ac963f116b471d 100644
--- a/duplicates/settings.gradle
+++ b/duplicates/settings.gradle
@@ -4,7 +4,7 @@
  * The settings file is used to specify which projects to include in your build.
  *
  * Detailed information about configuring a multi-project build in Gradle can be found
- * in the user manual at https://docs.gradle.org/5.6.1/userguide/multi_project_builds.html
+ * in the user manual at https://docs.gradle.org/6.3/userguide/multi_project_builds.html
  */
 
-rootProject.name = 'duplicates'
+rootProject.name = 'campus'
diff --git a/duplicates/tmp/duplicates-and-carddecks b/duplicates/tmp/duplicates-and-carddecks
deleted file mode 160000
index b0e34168ff50c832cd92da1362f4117695bc50bb..0000000000000000000000000000000000000000
--- a/duplicates/tmp/duplicates-and-carddecks
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit b0e34168ff50c832cd92da1362f4117695bc50bb