{TAIL ~ A tone detector} for detecting {HEAD ~ a tone} having a plurality of targeted frequencies, comprising: 
{ TAIL ~ A tone detector } for detecting { HEAD ~ a tone } having a plurality of targeted frequencies , comprising :
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH