{HEAD ~ The strips} are rotated in {TAIL ~ opposite directions} so that corresponding edges are toward each other, and the inner face of one strip and the outer face of the second strip are at the top of the strips 
{ HEAD ~ The strips } are rotated in { TAIL ~ opposite directions } so that corresponding edges are toward each other , and the inner face of one strip and the outer face of the second strip are at the top of the strips
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH