sclass ai_Reconstructed {
  WeightedProduction production;
  AI_BottomUpParser1.Word a, b; // b may be null if it's a subclassing
  
  *(WeightedProduction *production, AI_BottomUpParser1.Word *a, AI_BottomUpParser1.Word *b) {}
  *(WeightedProduction *production, AI_BottomUpParser1.Word *a) {}
  
  toString { ret sfu(production) + " - " + a.text() + (b == null ? "" : " + " + b.text()); }
}