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