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	def _IsReversed(e, td, points):	def _IsReversed(e, td, points):
	"""If e=(a,b) is a non-border edge, with left-face triangle tl and	"""If e=(a,b) is a non-border edge, with left-face triangle tl and
	right-face triangle tr, then it is 'reversed' if the circle through	right-face triangle tr, then it is 'reversed' if the circle through
	a, b, and (say) the other vertex of tl containts the other vertex of tr.	a, b, and (say) the other vertex of tl contains the other vertex of tr.
	td is a _TriDict, for finding triangles containing edges, and points	td is a _TriDict, for finding triangles containing edges, and points
	gives the coordinates for vertex indices used in edges."""	gives the coordinates for vertex indices used in edges."""

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