{TAIL ~ Contoured stationary plows} are included at a downstream end of {HEAD ~ the contiguous belt spans} to assist in turning the envelopes over 
{ TAIL ~ Contoured stationary plows } are included at a downstream end of { HEAD ~ the contiguous belt spans } to assist in turning the envelopes over
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH