In {TAIL ~ a preferred embodiment}, the first roll includes a plurality of first and second elements arranged in {HEAD ~ a pattern} 
In { TAIL ~ a preferred embodiment } , the first roll includes a plurality of first and second elements arranged in { HEAD ~ a pattern }
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD