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