The heated air then passes through {TAIL ~ the flow} of {HEAD ~ grain} in each of the columns 26 so as to heat and remove moisture from the grain 
The heated air then passes through { TAIL ~ the flow } of { HEAD ~ grain } in each of the columns 26 so as to heat and remove moisture from the grain
OTH OTH 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 OTH OTH