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