:- module(graphs).
:- export warshall / 2.
:- export vertices / 2.
:- export top_sort / 2.
:- export s_transpose / 2.
:- export s_to_p_trans / 2.
:- export s_to_p_graph / 2.
:- export s_member / 3.
:- export p_transpose / 2.
:- export p_to_s_graph / 2.
:- export p_member / 3.
:- export compose / 3.