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A few weeks ago, Matt Parker released a video where he posed a question he’d received from a viewer about the popular game Wordle: how many words can you try in a Wordle game without reusing a letter? At most, the answer can be 5 (25 letters total with one unused). So the question becomes: are there sets of five English words without any overlapping letters, and (while we’re at it) if so, how many?...