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<PRE>
Abelian: <b>trait</b>
  <b>introduces</b> __ \circ __: T, T -&gt; T
  <b>asserts</b> <b>forall</b> x, y: T
    x \circ y == y \circ x
  <b>implies</b> <A HREF="Commutative.html">Commutative</A> (T <b>for</b> Range)
</PRE>

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