For a display position, {TAIL ~ the user} specifies {HEAD ~ at least one subregion} of the subdivided original image 
For a display position , { TAIL ~ the user } specifies { HEAD ~ at least one subregion } of the subdivided original image
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH