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