A person dressed in blue is riding a motorcycle.
There is a person on a vehicle in this picture.
person on a vehicle can also be said as a person riding a motorcycle.
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_ride(e2) & n_motorcycle(x4) & in(e1,x3) & n_blue(x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_person(x1))
exists p1 x1 x4.(n_picture(x4) & exists x2 x3.((x1 = x2) & on(x2,x3) & in(x3,x4) & n_vehicle(x3) & n_person(x2)))