The length in {HEAD ~ the food forward direction} of each of {TAIL ~ the separated chamber} is equal to or longer than that of just before chamber 
The length in { HEAD ~ the food forward direction } of each of { TAIL ~ the separated chamber } is equal to or longer than that of just before chamber
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH