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But you would never define it like this in Haskell...

You'd probably do something like: let n - m = ( n + (-m) ) `mod` 6

'let 3 - 4 = 5' is just a non-sense example.

For much the same reason, one would probably never want to write "let 1 = 1", but it's still a valid statement. It may not be interesting, but it's not nonsense.

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