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