At the opposied corners of the trapezoidally shaped crotch portion adjacent {HEAD ~ the side} of the crotch portion which is spaced from, and extends parallel to, the longitudinal axis of the elongated wing portions, the crotch portion carries a pair of {TAIL ~ securing elements} 
At the opposied corners of the trapezoidally shaped crotch portion adjacent { HEAD ~ the side } of the crotch portion which is spaced from , and extends parallel to , the longitudinal axis of the elongated wing portions , the crotch portion carries a pair of { TAIL ~ securing elements }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL