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