Four people in life jackets float on a raft.
Some people are white water rafting in a river.
People can float on a river and not be white water rafting.
exists e1 x1 x2 x3 x4.(on(e1,x4) & n_raft(x4) & Actor(e1,x1) & v_float(e1) & in(x1,x2) & n_jacket(x2) & of(x2,x3) & n_life(x3) & n_people(x1) & card_eq_4(x1))
exists e1 p1 x1 x2.(for(p1,e1) & in(e1,x2) & n_river(x2) & Actor(e1,x1) & v_raft(e1) & exists s1 x3.((x1 = x3) & n_water(x3) & a_white(s1) & Theme(s1,x3)) & n_people(x1))