{TAIL ~ A belt structure} conveys {HEAD ~ the block} of material from the first end of the conveyor over the second end of the conveyor 
{ TAIL ~ A belt structure } conveys { HEAD ~ the block } of material from the first end of the conveyor over the second end of the conveyor
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH