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…).  N is its Segment Number. 

Each Wall Segment in a Workbench is Above all Wall Segments in the same Workbench that have a lower Segment Number.  A Wall Segment is Directly Above another Wall Segment if it is Above that other Wall Segment and has a Segment Number 1 greater than that other Wall Segment’s Segment Number.

A Wall Layer is well-formed if it fits all the following criteria:
*Either its Segment Number is 0 or it is Directly Above another Wall Segment.
*All bricks in the Wall Segment have a defined height and a Dimensions attribute.
*The [y] 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 Segment 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 Segments that are not Well-Formed and return the bricks they contain to their owners’ Buckets.