The skater is descending the wooden wall beside the slope.
The skater is descending the brick wall beside the slope.
The wall cannot be both wooden and brick.
exists e1 s1 x1 x2 x3.(n_slope(x3) & n_wall(x2) & a_wooden(s1) & Theme(s1,x2) & n_skater(x1) & beside(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_descend(e1))
exists e1 x1 x2 x3 x4.(n_slope(x4) & n_wall(x2) & of(x2,x3) & n_brick(x3) & n_skater(x1) & beside(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_descend(e1))