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