{HEAD ~ The replaceable sludge can} is disposed at an opening of the bottom of {TAIL ~ the external container} 
{ HEAD ~ The replaceable sludge can } is disposed at an opening of the bottom of { TAIL ~ the external container }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL