/guava/android/guava/src/com/google/common/graph/DirectedMultiNetworkConnections.java
checkState( predecessors.remove( node) ) ;checkState( predecessors.add( node) ) ;
checkState ( predecessors.add ( node ) ) ;
} @Override public void addInEdge(E edge, N node, boolean isSelfLoop) { super.addInEdge(edge, node, isSelfLoop); Multiset<N> predecessors = getReference(predecessorsReference); if (predecessors != null) { <extra_id_0> } } @Override public void addOutEdge(E edge, N node) { super.addOutEdge(edge, node); Multiset<N> successors = getReference(successorsReference);