Example

string w[4] = { "forward", "cursor", "code", "example" };
DFA_bin a;
tree_build(a, w, w + 4);
forward_cursor c(a, a.initial());
assert(c.first_transition());
do cout << "src " << c.src() << " letter " << c.letter
        << " aim " << c.aim();
while (c.next_transition());