Skateboarders are doing tricks on a staircase next to mirror buildings.
The skateboarders are professionals.
Skateboarders are doing tricks on a staircase next to mirror buildings does not mean they are professionals
exists e1 p1 x1 x2 x3 x4.(r_next(e1) & Topic(e1,p1) & exists e2 x5.(Theme(e2,x5) & Actor(e2,x1) & v_mirror(e2) & n_building(x5)) & on(e1,x4) & n_staircase(x4) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_trick(x3) & n_skateboarder(x2) & n_skateboarder(x1))
exists p1 x1.(n_skateboarder(x1) & exists x2.((x1 = x2) & n_professional(x2)))