LOAD get_vouchers 0 MAP get_vouchers MOUT back 0 MOUT quit 99 MNEXT next 11 MPREV prev 22 HALT LOAD view_voucher 80 RELOAD view_voucher CATCH . flag_incorrect_voucher 1 INCMP _ 0 INCMP quit 99 INCMP > 11 INCMP < 22 INCMP view_voucher *