====== Graph directed ======
{{tag>graphs}}
===== Description =====
Example of a directed graph

**Source**:  The Art of Prolog
===== Download =====
Program source code: {{graph_directed.pl}}
===== Listing =====
<code prolog>
edge(a,b).
edge(a,c).
edge(b,d).
edge(c,d).
edge(d,e).
edge(f,g).

%	Program 2.6: A directed graph
</code>
===== Comments =====