Dictionaries used:

• Most common 1k English words: https://gist.github.com/deekayen/4148741
• Most common 5k English words: https://github.com/tgmgroup/Word-List-from-Oxford-Longman-5000/tree/master
• Whole dictionary (479k words): https://github.com/dwyl/english-words

Tutorials/external code used:

• English dictionary implementation idea: https://stackoverflow.com/questions/8986543/how-to-implement-an-english-dictionary-in-java
• Reading files in Java: https://www.w3schools.com/java/java_files_read.asp
• HashSet: https://www.w3schools.com/java/java_hashset.asp
• Try/Catch: https://www.w3schools.com/java/java_try_catch.asp
• Set toArray() method in Java: https://www.geeksforgeeks.org/set-toarray-method-in-java-with-example/
• Do/While loop: https://www.w3schools.com/java/java_while_loop_do.asp
• currentTimeMillis() method: https://www.tutorialspoint.com/java/lang/system_currenttimemillis.htm
• HashMap: https://www.w3schools.com/java/java_hashmap.asp