One of skill in the art should also understand that {HEAD ~ the first roll} could also include more than two different types of elements, and that the disclosure of {TAIL ~ a first and second element} is meant to be illustrative, rather than limiting 
One of skill in the art should also understand that { HEAD ~ the first roll } could also include more than two different types of elements , and that the disclosure of { TAIL ~ a first and second element } is meant to be illustrative , rather than limiting
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH