A young man skates down the side of a colorful wall.
There are dogs in the park.
Man and dogs are contradictory.
exists e1 s1 s2 x1 x2 x3.(n_side(x2) & down(e1,x2) & of(x2,x3) & n_wall(x3) & a_colorful(s2) & Theme(s2,x3) & Actor(e1,x1) & v_skate(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1 x2.(n_park(x2) & in(p1,x2) & exists x3.((x1 = x3) & n_dog(x3)))