=item Z<>0
- The operation failed. In case of the add operation, it was tried to add
- the same (identical) session twice. In case of the remove operation, the
- session was not found in the cache.
+The operation failed. In case of the add operation, it was tried to add
+the same (identical) session twice. In case of the remove operation, the
+session was not found in the cache.
=item Z<>1
- The operation succeeded.
+The operation succeeded.
=back