Two bike riders are riding their road bikes through a state park filled with campers and other bikers.
The bikers are walking their bikes through the state park.
One can not be walking and riding simultaneously.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10.(n_biker(x10) & through(e1,x4) & with(e2,x7) & subset_of(x9,x7) & -(x9 = x10) & n_biker(x9) & subset_of(x8,x7) & n_camper(x8) & Theme(e2,x6) & v_fill(e2) & (x4 = x6) & n_park(x4) & of(x4,x5) & n_state(x5) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_bike(x2) & of(x2,x3) & n_road(x3) & of(x2,x1) & n_thing(x1) & n_rider(x1) & of(x1,x2) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(n_park(x3) & of(x3,x4) & n_state(x4) & n_bike(x2) & of(x2,x1) & n_thing(x1) & n_biker(x1) & through(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_walk(e1))