Several tourists photograph pictures over the sea.
A dog is running after its tail.
A group of tourists and a dog are completely different entities.  The tourists are taking pictures, while the dog is running
exists e1 s1 x1 x2 x3.(n_sea(x3) & over(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_photograph(e1) & n_picture(x2) & n_tourist(x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2.(after(e1,x2) & n_tail(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_run(e1) & n_dog(x1))