Two men are kayaking in whitewater.
Some people are on kayaks.
kayaks can only be kayaking.
exists e1 x1 x2.(in(e1,x2) & n_whitewater(x2) & Actor(e1,x1) & v_kayake(e1) & n_man(x1) & card_eq_2(x1))
exists p1 x1.(exists x2.(on(x1,x2) & n_kayak(x2)) & n_people(x1))