A young man is riding a half pipe on a skateboard as a another young man rides a bicycle in the background.
Two friends are hiking in the woods.
If they are riding a half pipe and riding a bicycle, they are not hiking.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8.(n_background(x8) & as(e1,x5) & Theme(e2,x7) & Actor(e2,x6) & v_ride(e2) & in(x7,x8) & n_bicycle(x7) & (x5 = x6) & n_man(x5) & a_young(s2) & Theme(s2,x5) & on(e1,x4) & n_skateboard(x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_pipe(x2) & of(x2,x3) & n_half(x3) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_wood(x2) & in(e1,x2) & Actor(e1,x1) & v_hike(e1) & n_friend(x1) & card_eq_2(x1))