A snowboarder is in the air above a ramp of snow.
A skateboarder is skating down the street
It cannot be snowboarder and skateboarder simultaneously.
exists p1 x1 x2 x3 x4.(n_air(x4) & above(p1,x2) & of(x2,x3) & n_snow(x3) & n_ramp(x2) & in(x1,x4) & n_snowboarder(x1))
exists e1 s1 x1 x2.(n_street(x2) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_skate(e1) & n_skateboarder(x1))