Three kids in a martial arts class are in a stance; each child has on a different color belt.
The boy in the middle has a blue belt.
The boy with the blue belt may not be in a stance.
exists p1 s1 x1 x2 x3.(all x5.(n_child(x5) -> exists e1 x6 x7 x8.(on(e1,x6) & -(x6 = x8) & n_belt(x8) & of(x8,x7) & n_color(x7) & n_belt(x6) & of(x6,x7) & Actor(e1,x5) & v_have(e1))) & exists x4.(in(x1,x4) & n_stance(x4)) & in(x1,x2) & n_class(x2) & of(x2,x3) & n_art(x3) & a_martial(s1) & Theme(s1,x2) & n_kid(x1) & card_eq_3(x1))
exists e1 s1 x1 x2 x3.(n_middle(x2) & n_boy(x1) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_belt(x3) & a_blue(s1) & Theme(s1,x3) & in(x1,x2))