The top ply 3″ includes {HEAD ~ a wall} 13″ which extends from {TAIL ~ the top ply bottom surface} 3 b″ 
extends from
The top ply 3″ includes { HEAD ~ a wall } 13″ which extends from { TAIL ~ the top ply bottom surface } 3 b″
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH