ElementSet lastSet() { return child.lastSet(); }
ElementSet lastSet() { return child.lastSet(); }
void buildDAG(ElementSet incoming) { child.buildDAG(ElementSets.union(incoming,child.lastSet())); }
void buildDAG(ElementSet incoming) { child.buildDAG(ElementSets.union(incoming,child.lastSet())); }
void buildDAG(ElementSet incoming) { child.buildDAG(ElementSets.union(incoming,child.lastSet())); }