The reverse of a 'sledgehammer' is again a 'sledgehammer'.
(The reverse of an algorithm is another algorithms that cancells the changes made by the first one.)
| Face | Position: | x: | -30 | y: | -45 | z: | 0 |
| UF'U'F | 0 | F'UFU' |
| (Each one of the 2 sledgehammers cancell the other.) | ||