Three people swimming in the water and one person on the sand is running into the water.
four people are outside
Three people and a person equals four people.
exists e1 e2 x1 x2 x3 x4 x5 x6.(n_water(x4) & n_water(x4) & n_sand(x6) & into(e2,x4) & Actor(e2,x1) & v_run(e2) & subset_of(x5,x1) & on(x5,x6) & n_person(x5) & card_eq_1(x5) & subset_of(x2,x1) & in(e1,x4) & Actor(e1,x3) & v_swim(e1) & (x2 = x3) & n_people(x2) & card_eq_3(x2))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_people(x1) & card_eq_4(x1))