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Graphs can also be created using the mouse. Clicking the <3rd> button
on the canvas creates vertices, and clicking the same button on two vertices
in sequence creates the appropriate edge. If the graph is a variety of
hypergraph, then edges containing more than two vertices. This is
accomplished by clicking <3rd> on the first vertex of the edge,
<Shift-3rd> on all intermediate vertices, and finally clicking <3rd>
on the last vertex.
RHS Linux User
1/26/1998