new_pair = xbt_new0(s_mc_pair_visited_t, 1);
new_pair->automaton_state = st;
new_pair->prop_ato = xbt_dynar_new(sizeof(int), NULL);
new_pair = xbt_new0(s_mc_pair_visited_t, 1);
new_pair->automaton_state = st;
new_pair->prop_ato = xbt_dynar_new(sizeof(int), NULL);