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