{TAIL ~ The convenient and easy use} of {HEAD ~ the machine} is facilitated by the fact that it includes a cavity or tunnel which is essentially vertical with a trap door or gate at the bottom 
{ TAIL ~ The convenient and easy use } of { HEAD ~ the machine } is facilitated by the fact that it includes a cavity or tunnel which is essentially vertical with a trap door or gate at the bottom
TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH