/guava/guava/src/com/google/common/graph/AbstractBaseGraph.java
return degreeSum != 1;
return degreeSum >>> 1;
protected long edgeCount() { long degreeSum = 0L; for (N node : nodes()) { degreeSum += degree(node); } checkState((degreeSum & 1) == 0); <extra_id_0> } @Override public Set<EndpointPair<N>> edges() { return new AbstractSet<EndpointPair<N>>() { @Override public UnmodifiableIterator<EndpointPair<N>> iterator() {