question: removes vertex from the graph being built , if such vertex existin graph . concode_field_sep G graph concode_field_sep B addVertices concode_elem_sep B removeEdge concode_elem_sep UnmodifiableGraph<V,E> buildUnmodifiable concode_elem_sep G build concode_elem_sep B self concode_elem_sep B addEdgeChain concode_elem_sep B addVertex concode_elem_sep B addEdge concode_elem_sep B addGraph concode_elem_sep B removeVertices
target: B function ( V arg0 ) { this . graph . removeVertex ( arg0 ) ; return this . self ( ) ; }