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| trait Semigroup[A] { | |
| def combine(x: A, y: A): A | |
| } | |
| trait Monoid[A] extends Semigroup[A] { | |
| def zero: A | |
| } | |
| // Laws: | |
| //Associativity | |
| append(a1, append(a2, a3)) == append(append(a1, a2), a3) | |
| //Identity | |
| append(a, zero) == a |
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