If you like, you can iterate through all the possible values and return a tuple, list, or set, by passing the generator expression to tuple(), list(), or set().Calling next( gen) returns the next value from the iterator.The generator expression returns… an iterator.The expression itself looks like a list comprehension, but it’s wrapped in parentheses instead of square brackets. A generator expression is like an anonymous function that yields values.Sets make it trivial to find the unique items in a sequence. This has nothing to do with the alphametics solver I just thought it was interesting. Then the third overlaps with the fourth, so the third is returned and the fourth is skipped. The first match overlaps with the second, so the first is returned and the second is skipped. Why is that? Because it doesn’t return overlapping matches. Specifically, it returned the first, the third, and the fifth.
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