|igraph Reference Manual|
igraph_vs_all— Vertex set, all vertices of a graph.
igraph_vs_adj— Adjacent vertices of a vertex.
igraph_vs_nonadj— Non-adjacent vertices of a vertex
igraph_vs_none— Empty vertex set.
igraph_vs_1— Vertex set with a single vertex.
igraph_vs_vector— Vertex set based on a vector.
igraph_vs_vector_small— Create a vertex set by giving its elements.
igraph_vs_seq— Vertex set, an interval of vertices.
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