anchor.diff:                                  KeyNoXCRight,
                                   SubtreeNoXCRight,
                                   KeyValuesXCRight,
  -                                case SubtreeNoXC == 0 of
  -                                    true ->
  +                                case SubtreeNoXC of
  +                                    0 ->
                                           [];
                                       _ ->
                                           InsertFunction(
  
positive.code:                                     KeyNoXC,
                                      SubtreeNoXC,
                                      KeyValuesXC,
                                      case SubtreeNoXC == 0 of
                                          true ->
                                              [];
                                          _ ->
                                              InsertFunction(
  
negative.code:                             KeyNoXCRight,
                              SubtreeNoXCRight,
                              KeyValuesXCRight,
                              case SubtreeNoXC of
                                  0 ->
                                      [];
                                  _ ->
                                      lists:append([
  