#define sym_1(sym, _1) sym

#define tape ( (,), /*
15:         */  1,(1,(1,(1,(1, (1,(1,(1,(1,(1,  (1,(1,(1,(1,(1, /*
blank:      */ (_, /*
50:         */ (1,(1,(1,(1,(1, (1,(1,(1,(1,(1,  (1,(1,(1,(1,(1, (1,(1,(1,(1,(1,  (1,(1,(1,(1,(1, (1,(1,(1,(1,(1,  (1,(1,(1,(1,(1, (1,(1,(1,(1,(1,  (1,(1,(1,(1,(1, (1,(1,(1,(1,(1, /*
            */ (,)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))) )