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>>> Shouldn't that be addn n = (n+) ?
>
>> It doesn't matter. Addition is usually a commutative operation.
>
> Unless you are using the + operator to, for example, concatenate strings...
Sure. In that case, it makes a difference - and so you'd better decide
which one you actually meant. But remember, Haskell's string concat
operator is (++), not (+).
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