// returns list of parsed sentences with round brackets
static LS recursiveProbabilisticParse(S productions, S sentenceClass, S input, O... _) {
  optPar RecursiveProbabilisticParser1 parser = new RecursiveProbabilisticParser1;
  parser.sentenceClass = sentenceClass;
  parser.productionsStartWithClass = true;
  parser.loadRules(productions);
  parser.useRoundBrackets = true;
  ret parser.parse(input);
}