static L<PairS> ai_sortMatchPairs(L<PairS> l) {
  l = map(func(S s) -> S { replaceSuffix(">", " >", s) }, l);
  l = pairsSortedByAComparator(alphaNumComparator(), l);
  l = map(func(S s) -> S { replaceSuffix(" >", ">", s) }, l);
  ret l;
}