Several dogs of different breeds play in a backyard.
The dogs are trying to hurt each other.
Dogs that are playing in the backyard are not trying to hurt each other.
exists e1 s1 x1 x2 x3 x4.(n_breed(x3) & in(e1,x4) & n_backyard(x4) & Actor(e1,x1) & v_play(e1) & of(x1,x2) & -(x2 = x3) & n_breed(x2) & n_dog(x1) & a_several(s1) & Theme(s1,x1))
exists e1 p1 x1.(n_dog(x1) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & all x2.(n_other(x2) -> exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_hurt(e2))))