Trucks race in an obstacle course.
Trucks are parked in a parking lot.
race is contradictory to parked
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x3) & n_course(x3) & of(x3,x4) & n_obstacle(x4) & n_race(x1) & (x1 = x2) & ne_nam_trucks(x2))
exists e1 x1 x2 x3.(in(e1,x2) & n_lot(x2) & of(x2,x3) & n_parking(x3) & Theme(e1,x1) & v_park(e1) & n_truck(x1))