public boolean unsetOrdering(Object first,Object second){
  DigraphNode firstPONode=(DigraphNode)poNodes.get(first);
  DigraphNode secondPONode=(DigraphNode)poNodes.get(second);
  return firstPONode.removeEdge(secondPONode) || secondPONode.removeEdge(firstPONode);
}

public boolean unsetOrdering ( Object first , Object second ) { DigraphNode firstPONode = ( DigraphNode ) poNodes . get ( first ) ; DigraphNode secondPONode = ( DigraphNode ) poNodes . get ( second ) ; return firstPONode . removeEdge ( secondPONode ) || secondPONode . removeEdge ( firstPONode ) ; }
removes any ordering between two nodes .
