static int substringsScoreICPosNeg(S s, Cl<S> pos, Cl<S> neg) {
  ret substringsScoreIC_optimized1(s, asCISet(pos))-substringsScoreIC_optimized1(s, asCISet(neg));
}

static int substringsScoreICPosNeg(S s, Pair<? extends Cl<S>> posNeg) {
  ret substringsScoreICPosNeg(s, posNeg.a, posNeg.b);
}