Two people take a walk down a wooded trail.
Two people ride their bikes down a paved trail.
If people ride their bikes, they didn't take a walk.
exists e1 s1 x1 x2 x3.(down(e1,x3) & n_trail(x3) & a_wooded(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_walk(x2) & n_people(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(down(e1,x3) & n_trail(x3) & a_paved(s1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & of(x2,x1) & n_thing(x1) & n_people(x1) & card_eq_2(x1))