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