"Source: Text/Incidence/Graph.text";
"Line: 1149";
"Date: Fri Sep 26 12:10:10 2025";
"Main: Fri Sep 26 14:29:19 2025";
// original file: Text/Incidence/Graph.text, line: 1149
// Example: H162E8 ()
print "Example: H162E8";
ei := GetEchoInput();
SetEchoInput(true);
S := Subsets({1..5}, 2);                                   
O3, V, E := Graph< S | { {u,v} : u,v in S | IsDisjoint(u, v) } >;
VertexSet(O3);
Vertices(O3); 
EdgeSet(O3);
Edges(O3);  
u := V!{1, 2};
u, Type(u);
Index(u);
x := E!{ {1,2}, {3,4}};
x, Type(x);
SetEchoInput(ei);
