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I have been trying to figure this out myself. The algorithm I'm using is to colour yellow only if the count of that letter before that occurance in the guess, is less than the count of that letter in the target word.



Looks good, here are some test cases off the top of my head.

guess: "SASSY", target: "BRASS", expect either "YYBGB" or "BYYGB". I believe your algorithm would return "YYYGB".

guess: "BRASS", target: "SASSY", expect "BBYGY"

guess: "ASSET", target: "BRASS", expect "YYYBB"

guess: "BRASS", target: "ASSET", expect "BBYYY"




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