{TAIL ~ The runner} is accommodated at the fixing portion, and is capable of up and down sliding movements at {HEAD ~ the fixing portion} 
{ TAIL ~ The runner } is accommodated at the fixing portion , and is capable of up and down sliding movements at { HEAD ~ the fixing portion }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD