Two people wearing yellow jackets crosscountry skiing.
Two people are outside in the snow.
Snow is required for skiing. Snow is necessarily outside. Therefore, if they are crosscountry skiing, they are necessarily outside in the snow.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_skiing(x3) & a_crosscountry(s2) & Theme(s2,x3) & of(x3,x4) & n_jacket(x4) & a_yellow(s1) & Theme(s1,x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists s1 x1 x2.(n_snow(x2) & in(s1,x2) & Theme(s1,x1) & a_outside(s1) & n_people(x1) & card_eq_2(x1))