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<PRE>
Associative (\circ, T): <b>trait</b>
  <b>introduces</b> __ \circ __: T, T -&gt; T
  <b>asserts</b> <b>forall</b> x, y, z: T
    (x \circ y) \circ z == x \circ (y \circ z)
</PRE>

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