Two girls are riding red tricycles.
The girls are wearing helmets.
You can not infer they are wearing helmets.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_tricycle(x2) & a_red(s1) & Theme(s1,x2) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_helmet(x2))