A motorcyclist with a backpack traveling on his blue bike.
a motocyclist riding a horse.
The motorcyclist is riding his blue bike, he can not ride a horse at the same time.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & on(e1,x4) & n_bike(x4) & a_blue(s1) & Theme(s1,x4) & of(x4,x1) & n_male(x1) & Actor(e1,x3) & v_travel(e1) & (x2 = x3) & n_backpack(x2) & n_motorcyclist(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_horse(x3) & (x1 = x2) & n_motocyclist(x1))