Upon detecting {HEAD ~ user selection} of {TAIL ~ an item} in the list, contact information is displayed for a respective caller corresponding to the user selected item 
of
Upon detecting { HEAD ~ user selection } of { TAIL ~ an item } in the list , contact information is displayed for a respective caller corresponding to the user selected item
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH