Two children climb an indoor rock walk as two other children are on belay.
Two kids slip on the ice.
One can not be on ice and on a rock walk simultaneously.
exists e1 p1 s1 x1 x2 x3.(exists p2 x4.(exists x5.(on(x4,x5) & n_belay(x5)) & -(x4 = x1) & n_child(x4) & card_eq_2(x4)) & n_child(x1) & n_child(x1) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_walk(x2) & of(x2,x3) & n_rock(x3) & a_indoor(s1) & Theme(s1,x2) & card_eq_2(x1))
exists e1 x1 x2.(n_ice(x2) & on(e1,x2) & Actor(e1,x1) & v_slip(e1) & n_kid(x1) & card_eq_2(x1))