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