In {TAIL ~ one embodiment}, {HEAD ~ the corrugation} have a pitch of five inches and a height of one half inch; in another embodiment, the pitch is six inches and the height is one inch 
In
In { TAIL ~ one embodiment } , { HEAD ~ the corrugation } have a pitch of five inches and a height of one half inch ; in another embodiment , the pitch is six inches and the height is one inch
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH