a naive implementation of derivatives would need to compute a transition for every possible character (up to 65536 in UTF-16). minterms fix this by partitioning the character space into equivalence classes where all characters in a class behave identically.
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Equal (0): Everything in this space must be equal to 0. The answer is 5-0, placed horizontally; 0-4, placed horizontally; 0-0, placed horizontally; 0-1, placed vertically.
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