When step 37 is reached, ambiguity should lie only in {TAIL ~ the presence} of {HEAD ~ a tone}, or a `stationary` voiced speech 
When step 37 is reached , ambiguity should lie only in { TAIL ~ the presence } of { HEAD ~ a tone } , or a ` stationary ` voiced speech
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH