0    1          IDENT
   1    6          expr -> IDENT
   6    9          ASSIGN
   9   24          assign-op -> ASSIGN
  24    2          NUMBER
   2   34          expr -> NUMBER
  34   18          LSHIFT
  18   29          shift-op -> LSHIFT
  29    2          NUMBER
   2   39          expr -> NUMBER
  39   20          PLUS
  20   30          add-op -> PLUS
  30    2          NUMBER
   2   40          expr -> NUMBER
  40   22          TIMES
  22   31          mul-op -> TIMES
  31    2          NUMBER
   2   41          expr -> NUMBER
  41   40          expr -> expr mul-op ^! expr
  40   39          expr -> expr add-op (^!)3 expr >>!!
  39   34          expr -> expr shift-op (^!)5 expr (>!)4
  34    6          expr -> expr assign-op (^!)15 expr (>!)14
   6               start -> expr