two police ride on the same bike.
Police are on the same bike.
Two police officers riding on the same bike.
exists s1 x1 x2 x3.(n_bike(x3) & a_same(s1) & Theme(s1,x3) & a_topic(x1) & on(x1,x3) & n_ride(x1) & of(x1,x2) & n_police(x2) & card_eq_2(x1))
exists p1 s1 x1 x2.(n_bike(x2) & a_same(s1) & Theme(s1,x2) & on(x1,x2) & n_police(x1))