4.1. igraph_isomorphic_34 — Graph isomorphism for 3-4 vertices

int igraph_isomorphic_34(const igraph_t *graph1, const igraph_t *graph2, 
			 igraph_bool_t *iso);

This function uses precomputed indices to decide isomorphism problems for graphs with only 3 or 4 vertices.

Arguments:

`graph1`:	The first input graph.
`graph2`:	The second input graph. Must have the same directedness as `graph1`.
`iso`:	Pointer to a boolean, the result is stored here.

Returns:

Error code.

Time complexity: O(1).