/guava/android/guava/src/com/google/common/graph/ImmutableGraph.java
mutableGraph.putEdge( nodeU) ;
mutableGraph.putEdge ( nodeU, nodeV ) ;
public Builder<N> addNode(N node) { mutableGraph.addNode(node); return this; } @CanIgnoreReturnValue public Builder<N> putEdge(N nodeU, N nodeV) { <extra_id_0> return this; } @CanIgnoreReturnValue public Builder<N> putEdge(EndpointPair<N> endpoints) { mutableGraph.putEdge(endpoints); return this;