The performing {HEAD ~ the task} corresponding to the first motion item may comprise, if the task corresponding to the first motion item is channel changing from among the second tasks, changing {TAIL ~ a current channel} to one of a previous channel and a next channel of the current channel 
comprise changing
The performing { HEAD ~ the task } corresponding to the first motion item may comprise , if the task corresponding to the first motion item is channel changing from among the second tasks , changing { TAIL ~ a current channel } to one of a previous channel and a next channel of the current channel
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH