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