{HEAD ~ The closure mechanism} corresponds to {TAIL ~ the retractable/deployable bolster} and allows the retractable/deployable bolster to be deployed or retracted 
corresponds to
{ HEAD ~ The closure mechanism } corresponds to { TAIL ~ the retractable / deployable bolster } and allows the retractable / deployable bolster to be deployed or retracted
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH