If Pepper backtracks on an uncompleted segment, it unzips. Sally backtracks and claims she was kidding. The interpreter backtracks if a failure is generated. As a result, if this set is detected unsatisfiable, the interpreter backtracks. Mother Courage backtracks on the price, and Swiss Cheese is killed. It was later released on the 2009 box set "Backtracks". When all values have been tried, the algorithm backtracks. The strategy fails and the "Bounty" backtracks eastward, costing the mission much precious time. It is essential that the interpreter is able to undo these changes when it backtracks. Cole backtracks in time to see Billee gallop off, leaving Ben alone. Three free "backtracks" are provided initially, which are replenished every three hours. The uncut versions of both songs were released on the 2009 box set "Backtracks". This version is available in the "Backtracks" box set. The following function backtracks the choices taken when computing the codice 11 table. It is also included on the "Backtracks" box set.