A group of motorcyclists drive around a parking lot.
People are riding motorcycles.
motorcyclists are people. Driving a motorcycle and riding one is the same thing.
exists e1 x1 x2 x3 x4.(around(e1,x3) & n_lot(x3) & of(x3,x4) & n_parking(x4) & Actor(e1,x1) & v_drive(e1) & of(x1,x2) & n_motorcyclist(x2) & n_group(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_motorcycle(x2) & n_people(x1))