x,y:Vertices(the_graph). the_obj.eq(x,y) 
x = y
T:Type, s:T, x:Vertices(the_graph), f:(TVertices(the_graph)T).
L:Vertices(the_graph) List.
(y:Vertices(the_graph). x-the_graph- > y (y 
L))
& the_obj.eacc(f,s,x) = list_accum(s',x'.f(s',x');s;L)
T:Type, s:T, f:(TVertices(the_graph)T).
L:Vertices(the_graph) List.
no_repeats(Vertices(the_graph);L)
& (y:Vertices(the_graph). (y L))
& the_obj.vacc(f,s) = list_accum(s',x'.f(s',x');s;L)
y:Vertices(the_graph). (y L)
no_repeats(Vertices(the_graph);filter(P;L))
P:(T), l:T List. no_repeats(T;l) 
no_repeats(T;filter(P;l))
None
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