A person walks in the valley between tall mountains.
A person is taking a hike.
Walks int he valley between tall mountains does not necessarily mean taking a hike.
exists e1 s1 x1 x2 x3.(n_valley(x2) & in(e1,x2) & between(x2,x3) & n_mountain(x3) & a_tall(s1) & Theme(s1,x3) & Actor(e1,x1) & v_walk(e1) & n_person(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_hike(x2) & n_person(x1))