static L<ai_Reconstructed> ai_buParser1_reconstructedProductions(AI_BottomUpParser1 parser, L<WeightedProduction> productions, AI_BottomUpParser1.Word group, S category) {
  L<ai_Reconstructed> l = new L;
  if (group == null) ret l;
  
  for (WeightedProduction prod : productions)
    if (eq(category, prod.c)) {
      //print("Matching prod: " + sfu(prod));
      if (prod.b == null) {
        if (group.hasClass(prod.a))
          l.add(ai_Reconstructed(prod, group));
        continue;
      }
        
      for (L<AI_BottomUpParser1.Word> parts : group.constituents) {
        if (l(parts) != 2) continue; // shouldn't happen
        AI_BottomUpParser1.Word partA = first(parts), partB = second(parts);
        if (!contains(partA.classes, prod.a)) continue;
        if (!contains(partB.classes, prod.b)) continue;
        l.add(ai_Reconstructed(prod, partA, partB));
        //print("  Found grouping: " + partA.text + " + " + partB.text);
      }
    }

  ret l;
}

Began life as a copy of #1017377