For {TAIL ~ experienced users}, {HEAD ~ cues} are rendered so that at any time the user can say a desired keyword to invoke the corresponding application 
For
For { TAIL ~ experienced users } , { HEAD ~ cues } are rendered so that at any time the user can say a desired keyword to invoke the corresponding application
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH