Two children are building something on the floor.
Two children are playing.
Two children are playing and building.
exists e1 x1 x2 x3.(n_floor(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_thing(x2) & n_child(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_2(x1))