The spar includes {HEAD ~ a female receptacle} that receives a male blade from {TAIL ~ the closeout skin assembly} 
The spar includes { HEAD ~ a female receptacle } that receives a male blade from { TAIL ~ the closeout skin assembly }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL