Four girls eat breakfast at a convention.
Four girls eat a vegetarian breakfast at a vegetarian convention.
Not all breakfasts are vegetarian and not all conventions are vegetarian.
exists e1 x1 x2 x3.(at(e1,x3) & n_convention(x3) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_breakfast(x2) & n_girl(x1) & card_eq_4(x1))
exists e1 s1 x1 x2 x3 x4.(at(e1,x4) & n_convention(x4) & a_vegetarian(s1) & Theme(s1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1) & n_breakfast(x2) & of(x2,x3) & n_vegetarian(x3) & n_girl(x1) & card_eq_4(x1))