One of the strips is then turned end to end without rotation, so that {TAIL ~ both faces} on the upper surface are {HEAD ~ either inner faces} or outer faces 
One of the strips is then turned end to end without rotation , so that { TAIL ~ both faces } on the upper surface are { HEAD ~ either inner faces } or outer faces
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH