Two men are riding on horses through the street.
Two men do questionable things with horses in the streets.
If one is riding horses then one is not doing questionable things.
exists e1 x1 x2 x3.(n_street(x3) & through(e1,x3) & on(e1,x2) & n_horse(x2) & Actor(e1,x1) & v_ride(e1) & n_man(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3 x4.(n_street(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & with(x2,x3) & in(x3,x4) & n_horse(x3) & n_thing(x2) & a_questionable(s1) & Theme(s1,x2) & n_man(x1) & card_eq_2(x1))