A dog leaps over a man to catch a disc.
There is a man and a dog.
The fact that dog is catching the disc by leaping over a man implies there is a man and a dog.
exists e1 p1 x1 x2.(over(e1,x2) & Topic(x2,p1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_catch(e2) & n_disc(x3)) & n_man(x2) & Actor(e1,x1) & v_leap(e1) & n_dog(x1))
exists p1 x1 x2 x3 x4.((x1 = x2) & subset_of(x4,x2) & n_dog(x4) & subset_of(x3,x2) & n_man(x3))