three people dressed in white are walking on stilts.
Three people on skateboards.
People can't be walking on stilts while they are on skateboards.
exists e2 e1 s1 x1 x2 x3 x4.(on(e2,x4) & n_stilt(x4) & Actor(e2,x1) & v_walk(e2) & Theme(e1,s1) & Theme(s1,x3) & a_white(s1) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_people(x1) & card_eq_3(x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_skateboard(x2) & n_people(x1) & card_eq_3(x1))