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This game works like the famous code-breaking game Mastermind, only with letters instead of colours, and words instead of patterns.
Your job is to guess the secret four-letter word in ten guesses or fewer. Each word you guess will reveal various clues about the secret word.
In particular, after each guess, you will be shown an empty (white) circle for every letter that the guessed word and the secret word have in common, and a filled (black) circle if that letter appears in the same position in both words.
From this information, you must use your powers of deduction™ to figure out the secret word.