The sign X coming immediately before, or immediately after, a bracket may be omitted; e.g.

We would if he'd let me bracket enough times instead of quitting just because he gets tired.

be enclosed in a bracket we obtain a partition of the weight w which appertains to the separated partition.

A partition is separated into separates so as to produce a separation of the partition by writing down a set of partitions, each separate partition in its own brackets, so that when all the parts of these partitions are reassembled in a single bracket the partition which is separated is reproduced.

it can be restored by moving the bracket till the bubble of the spirit-level is central, and then clamping it.