@pimms.value<EOL><INDENT>def vertex_edges(labels, vertex_edge_index):<DEDENT>
return tuple([vertex_edge_index[u] for u in labels])<EOL>
tess.vertex_edges is a tuple whose elements are tuples of the edge indices of the edges
that contain the relevant vertex; i.e., for vertex u with vertex index i,
tess.vertex_edges[i] will be a tuple of the edges indices that contain vertex u.