The profiles are initially provided in {TAIL ~ the fully engaged condition} within {HEAD ~ an elongate, longitudinally cut tube} 
The profiles are initially provided in { TAIL ~ the fully engaged condition } within { HEAD ~ an elongate , longitudinally cut tube }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD