Three kids in a martial arts class are in a stance; each child has on a different color belt.
Three sisters are at martial arts class; each has a different colored belt.
The kids in class together doesn't imply that they are sisters.
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 p1 s3 x1 x6.(n_belt(x6) & a_colored(s3) & Theme(s3,x6) & all x4.(n_thing(x4) -> exists e1 s2 x5.(Theme(e1,x5) & Actor(e1,x4) & v_have(e1) & -(x5 = x6) & n_belt(x5) & a_colored(s2) & Theme(s2,x5))) & exists s1 x2 x3.(at(x1,x2) & n_class(x2) & of(x2,x3) & n_art(x3) & a_martial(s1) & Theme(s1,x2)) & n_sister(x1) & card_eq_3(x1))