Main comment stating the purpose of this class and relevant relationship to other classes.

Possible useful expressions for doIt or printIt.

Structure:
instVar1 type -- comment about the purpose of instVar1
instVar2 type -- comment about the purpose of instVar2

Any further useful comments about the general approach of this implementation.

	edges
	incidentEdgesAt: removeEdge:

	initializing
	initialize

	private
	attachHalfedge: closestEdgeTo: cutHalfedge:

	tagging
	clearAllEdgeTags clearAllTags clearAllVertexTags

	accessing	top
	edgeFrom:to:
	faces
	halfedges
	length
	removeTriangle:
	triangle:to:to:
	vertexAt:
	vertices

	edges	top
	incidentEdgesAt:
	removeEdge:

	initializing	top
	initialize

	private	top
	attachHalfedge:
	closestEdgeTo:
	cutHalfedge:

	tagging	top
	clearAllEdgeTags
	clearAllTags
	clearAllVertexTags

	instance creation	top
	new Answer a new instance of the receiver (which is a class) with no indexable variables. Fail if the class is indexable.