The open end portions function to receive {HEAD ~ the blade} from {TAIL ~ the ceiling fan} therein 
from
The open end portions function to receive { HEAD ~ the blade } from { TAIL ~ the ceiling fan } therein
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH