+ f = return F :: Gen Cardinal
+ b = return B :: Gen Cardinal
+ l = return L :: Gen Cardinal
+ r = return R :: Gen Cardinal
+ d = return D :: Gen Cardinal
+ t = return T :: Gen Cardinal
+ fl = return FL :: Gen Cardinal
+ fr = return FR :: Gen Cardinal
+ fd = return FD :: Gen Cardinal
+ ft = return FT :: Gen Cardinal
+ bl = return BL :: Gen Cardinal
+ br = return BR :: Gen Cardinal
+ bd = return BD :: Gen Cardinal
+ bt = return BT :: Gen Cardinal
+ ld = return LD :: Gen Cardinal
+ lt = return LT :: Gen Cardinal
+ rd = return RD :: Gen Cardinal
+ rt = return RT :: Gen Cardinal
+ fld = return FLD :: Gen Cardinal
+ flt = return FLT :: Gen Cardinal
+ frd = return FRD :: Gen Cardinal
+ frt = return FRT :: Gen Cardinal
+ bld = return BLD :: Gen Cardinal
+ blt = return BLT :: Gen Cardinal
+ brd = return BRD :: Gen Cardinal
+ brt = return BRT :: Gen Cardinal
+ i = return I :: Gen Cardinal