In {HEAD ~ one embodiment}, {TAIL ~ a single double wall} is formed in both the top and bottom plies 
In { HEAD ~ one embodiment } , { TAIL ~ a single double wall } is formed in both the top and bottom plies
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH