Two girls pet a small kangaroo in a grassy field.
The children are playing with a frisbee at the park.
The children can not be petting a small kangaroo and playing with a frisbee at the same time.
exists s1 s2 s3 x1 x2 x3 x4.(a_topic(x1) & Theme(s3,x3) & Actor(s3,x2) & a_pet(s3) & in(x3,x4) & n_field(x4) & a_grassy(s2) & Theme(s2,x4) & n_kangaroo(x3) & a_small(s1) & Theme(s1,x3) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_park(x3) & n_child(x1) & with(e1,x2) & at(x2,x3) & n_frisbee(x2) & Actor(e1,x1) & v_play(e1))