{TAIL ~ a receiving portion} which has {HEAD ~ a space} for pulling in the second end portion of the stopper 
{ TAIL ~ a receiving portion } which has { HEAD ~ a space } for pulling in the second end portion of the stopper
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH