A receiving space is formed among {HEAD ~ the two pairs} of the stabilizing wings and {TAIL ~ the holding portions} 
of
A receiving space is formed among { HEAD ~ the two pairs } of the stabilizing wings and { TAIL ~ the holding portions }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL