A belt is extendable from {TAIL ~ the retractor} and retractable by {HEAD ~ the retractor} 
A belt is extendable from { TAIL ~ the retractor } and retractable by { HEAD ~ the retractor }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD