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