-- -*- M2-comint -*- {* hash: 1048280946 *}

i1 : V = {a,b,c,d};

i2 : E = {(a,b), (a,c), (c,d)};

i3 : G = directedGraph (V,E)

o3 = DirectedGraph{cache => CacheTable                      }
                   DirectedEdges => {(a, b), (a, c), (c, d)}
                   Vertices => {a, b, c, d}

o3 : DirectedGraph

i4 :