A man using a metal detector walking on the beach as people are in the water and on the beach.
A man is searching for items on a beach.
a man using metal detector does not imply he is searching for items.
exists e1 p1 x1 x2 x3 x4 x5 x6 x8.(n_beach(x6) & n_beach(x6) & n_water(x8) & a_topic(x1) & exists p2 x7.(on(x7,x6) & in(x7,x8) & n_people(x7)) & as(e1,p1) & Theme(e1,x3) & Actor(e1,x2) & v_use(e1) & on(x3,x6) & n_walking(x3) & of(x3,x5) & n_detector(x5) & of(x3,x4) & n_metal(x4) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(for(e1,x2) & on(x2,x3) & n_beach(x3) & n_item(x2) & Actor(e1,x1) & v_search(e1) & n_man(x1))