static Int find3_levenWithSwapsDistance(S pat, S input) {
  LS tokPat = parse3_cachedPattern(pat);
  LS tok = parse3_cachedInput(input);
  int end = tok.size()-tokPat.size()+1;
  
  Int min = null;
  for (int idx = 0; idx < end; idx += 2) {
    int score = 0;
    for (int i = 1; i < tokPat.size(); i += 2) {
      S p = tokPat.get(i), t = tok.get(idx+i);
      score += levenWithSwapsIC(p, t);
    }
    min = min_withNull(min, score);
  }
  
  ret min;
}