https://stackoverflow.com/questions/35560067/why-doesnt-arraylist-as-key-in-hashmap-work
“Why Doesn't ArrayList as Key in HashMap Work?” Java - Why Doesn't ArrayList as Key in HashMap Work? - Stack Overflow, stackoverflow.com/questions/35560067/why-doesnt-arraylist-as-key-in-hashmap-work. Accessed 14 June 2017.
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