{TAIL ~ Large and small cannisters} are provided at {HEAD ~ the respective ends} of a pivotable frame 
{ TAIL ~ Large and small cannisters } are provided at { HEAD ~ the respective ends } of a pivotable frame
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH