Two feet wearing yellow ski boots on ski
The person is about to ski.
There is no contradiction in wearing ski boots on ski and being about to ski.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & on(x3,x5) & n_ski(x5) & n_boot(x3) & of(x3,x4) & n_ski(x4) & a_yellow(s1) & Theme(s1,x3) & (x1 = x2) & n_foot(x1) & card_eq_2(x1))
exists p1 s1 x1.(n_person(x1) & Topic(s1,p1) & Actor(s1,x1) & a_about(s1) & exists e1.(Actor(e1,x1) & v_ski(e1)))