One man in all thermal wear is hiking up a snowy hillside.
A man sleds down a hill.
Answer; One cannot be hiking up or sleds down at the same time
exists x1.(all x2 s1.((n_wear(x2) & a_thermal(s1) & Theme(s1,x2)) -> exists e1 s2 s3 x3.(a_up(s3) & Manner(e1,s3) & Theme(e1,x3) & Actor(e1,x1) & v_hike(e1) & n_hillside(x3) & a_snowy(s2) & Theme(s2,x3) & in(x1,x2))) & n_man(x1) & card_eq_1(x1))
exists e1 s1 x1 x2.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_sled(e1) & n_hill(x2) & n_man(x1))