In a preferred embodiment, the first roll includes at least a first and second element extending radially therefrom, with {HEAD ~ the first element} having {TAIL ~ a greater radial height} than the second element, which avoids contact with the third roll 
having
In a preferred embodiment , the first roll includes at least a first and second element extending radially therefrom , with { HEAD ~ the first element } having { TAIL ~ a greater radial height } than the second element , which avoids contact with the third roll
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH