two people on a small boat in the middle of the ocean.
People are fishing for crabs.
We do not know what the people are doing, therefore we can not say they are fishing for crabs.
exists s1 x1 x2 x3 x4.(n_ocean(x4) & n_middle(x3) & a_topic(x1) & on(x1,x2) & in(x2,x3) & of(x3,x4) & n_boat(x2) & a_small(s1) & Theme(s1,x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(for(e1,x2) & n_crab(x2) & Actor(e1,x1) & v_fish(e1) & n_people(x1))