anchor.diff:                  }
               },
               {"B", {'if',
  -                    [{tand(gte({'#', SpaceD}, 1),
  -                           lte({'#', SpaceD}, 1024)),
  -                      {'#', SpaceD}}],
  +                    tand(gte({'#', SpaceD}, 1),
  +                         lte({'#', SpaceD}, 1024)),
  +                    {'#', SpaceD},
                       1
                   }
               }
  
positive.code:         {wheredim,
              {wherevar, "A", [
              {"A", {'if',
                      [{lte({'#', TimeD}, 0), "B"}],
                      {'@',
                          plus({'@', "A", {t, [{SpaceD,      times({'#', SpaceD}, 2    )}]}},
                               {'@', "A", {t, [{SpaceD, plus(times({'#', SpaceD}, 2), 1)}]}}),
  
negative.code:                                 {t, [{TimeD, minus({'#', TimeD}, 1)}]}}}},
                      {"X1",
                          {'if',
                              tand(
                                  tand(gte({'#', XD}, 1), lte({'#', YD}, 1024)),
                                  tand(gte({'#', YD}, 1), lte({'#', YD}, 1024))),
                              {'#', XD},
                              1}}
                  ]},
              [{TimeD,2}, {XD,0}, {YD,0}]},
  