People rock crawl up a steep obstacle.
Two people go swimming.
The people are either swimming or rock crawling.
exists s1 x1 x2 x3 x4.(a_topic(x1) & up(x1,x4) & n_obstacle(x4) & a_steep(s1) & Theme(s1,x4) & n_crawl(x1) & of(x1,x3) & n_rock(x3) & of(x1,x2) & n_people(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_go(e1) & n_swimming(x2) & n_people(x1) & card_eq_2(x1))