An elderly man and young boy are sitting on the ground, and playing with a train set.
The people are at the game.
the people cannot be both at the game and an elderly man and young boy playing trains.
exists e2 e1 s1 s2 s3 s4 x1 x2 x3 x4 x5 x6 x7 x8 x9.(n_ground(x4) & with(e2,x8) & n_set(x8) & of(x8,x9) & n_train(x9) & Actor(e2,x5) & v_play(e2) & n_boy(x7) & a_young(s4) & Theme(s4,x7) & n_man(x6) & subset_of(x7,x5) & subset_of(x6,x5) & a_elderly(s3) & Theme(s3,x5) & on(e1,x4) & Actor(e1,x1) & v_sit(e1) & n_boy(x3) & a_young(s2) & Theme(s2,x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1) & a_elderly(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_game(x2) & n_people(x1) & at(x1,x2))