Add a new Rule to the Ruleset.  Call it “The Great Wall” and give it the following text:

A Construction is a Wall Segment if its name is of the form “Wall Segment N”, where N is a natural number. (i.e. 0, 1, 2, 3…)

A Wall Layer is well-formed if it fits all the following criteria:
*Either N is 0 or the Mini Figure whose Workbench contains the Wall Segment also contains a Wall Segment N-1.
*All bricks in the Wall Segment have a defined height and a Dimensions attribute.
*The x dimensions of the bricks in the Wall Segment sum to at least 1 and no more than 12.
*All bricks in the Wall Segment have the same height

If a Wall Layer that is not well-formed is ever present in a Mini Figure’s Workbench, it is immediately disassembled and the bricks it contains are returned to that Mini Figure’s Bucket.

Disassemble any Wall Layers that are not Well-Formed and return the bricks they contain to their owners’ Buckets.