iven a vertex "ab1" that is shared between the two loops, return true if
     the two associated wedges (a0, ab1, b2) and (b0, ab1, b2) are equivalent
     to an edge crossing.  The loop relation is also allowed to maintain its
     own internal state, and can return true if it observes any sequence of
     wedges that are equivalent to an edge crossing.
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			</section>
			
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							<p>ericv@go