private static Clique valueOfHelper(int[] relativeIndices) {
    // if clique already exists, return that one
    Clique c = new Clique();
    c.relativeIndices = relativeIndices;
    return intern(c);
  }
private static Clique valueOfHelper ( int [ ] relativeIndices ) { Clique c = new Clique ( ) ; c . relativeIndices = relativeIndices ; return intern ( c ) ; }
This version assumes relativeIndices array no longer needs to
be copied. Further it is assumed that it has already been
checked or assured by construction that relativeIndices
is sorted.