For example, a mechanism is provided to enable {TAIL ~ access points} to perform {HEAD ~ automatic channel selection} 
For example , a mechanism is provided to enable { TAIL ~ access points } to perform { HEAD ~ automatic channel selection }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD