At the opposied corners of the trapezoidally shaped crotch portion adjacent 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 {HEAD ~ a pair} of {TAIL ~ securing elements} 
At the opposied corners of the trapezoidally shaped crotch portion adjacent 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 { HEAD ~ a pair } of { TAIL ~ securing elements }
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