Failure

Try another move on the resulting zipper, if the current move did not fail

Obtain the resulting zipper or throw an exception if the move failed

Try another zipper if the current move failed

Try another safe move if the current move failed

Safely move the resulting zipper, if the current move did not fail

Try a result of another move if the current move failed

Try another move if the current move failed

Obtain the resulting zipper or the original zipper in case the move failed

Obtain the resulting zipper or None if the move failed

Change the starting point of the move