Two feet wearing yellow ski boots on ski
The ski boots were a precaution but not necessary feet attire.
Ski boots are not always worn as a precaution against injury. It could be someone trying on boots and skis for fit, or a model wearing them to have their picture taken.
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 x1 x2.(n_boot(x1) & of(x1,x2) & n_ski(x2) & exists x3 x4.((x1 = x3) & -exists s1 x5 x6.(subset_of(x5,x3) & n_attire(x5) & of(x5,x6) & n_foot(x6) & a_necessary(s1) & Theme(s1,x5)) & subset_of(x4,x3) & n_precaution(x4)))