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