[<A HREF="Asymmetric.ps">PostScript</A>]

<PRE>
Asymmetric (\rel): <b>trait</b>
  <b>introduces</b> __ \rel __: T, T -&gt; Bool
  <b>asserts</b> <b>forall</b> x, y: T
    x \rel y =&gt; ~(y \rel x)
</PRE>

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