A group of four boys plays with mud in the water and grass.
Little girls are swimming.
It is hard to swim in mud and grass.
exists e1 x1 x2 x3 x4 x5 x6.(n_water(x5) & with(e1,x3) & subset_of(x6,x3) & n_grass(x6) & subset_of(x4,x3) & in(x4,x5) & n_mud(x4) & Actor(e1,x1) & v_play(e1) & of(x1,x2) & n_boy(x2) & card_eq_4(x2) & n_group(x1))
exists e1 s1 x1.(Actor(e1,x1) & v_swim(e1) & n_girl(x1) & a_little(s1) & Theme(s1,x1))