In the skate park, a guy is skateboarding and another is biking.
a couple of guys in wheelchairs at the park
People cannot be skateboarding or biking while in wheelchairs.
exists e2 e1 x1 x2 x3 x4 x5 x6.(n_park(x5) & of(x5,x6) & n_skate(x6) & n_park(x2) & of(x2,x3) & n_skate(x3) & in(e2,x5) & Actor(e2,x4) & v_bike(e2) & n_thing(x4) & in(e1,x2) & Actor(e1,x1) & v_skateboard(e1) & n_guy(x1))
exists x1 x2 x3 x4.(n_park(x4) & a_topic(x1) & at(x1,x4) & in(x1,x3) & n_wheelchair(x3) & of(x1,x2) & n_guy(x2) & n_couple(x1))