A white sign with a blue arrow instructs people where to go.
People lost on a hike will benefit from the directions on the sign.
The fact that there is a sign that instructs people does not imply that the sign is for the benefit of people lost on a hike.
exists e1 s1 s2 x1 x2 x3 x4 x5.(for(x2,x1) & with(x2,x3) & Theme(e1,x5) & Actor(e1,x4) & v_instruct(e1) & n_people(x5) & (x3 = x4) & n_arrow(x3) & a_blue(s2) & Theme(s2,x3) & n_manner(x2) & exists e2 x6.(Actor(e2,x6) & v_go(e2)) & n_sign(x1) & a_white(s1) & Theme(s1,x1))
exists e1 e2 x1 x2 x3 x4 x5.(n_sign(x5) & n_direction(x4) & on(e1,x2) & from(e2,x4) & on(x4,x5) & Actor(e2,x3) & v_benefit(e2) & (x2 = x3) & n_hike(x2) & Actor(e1,x1) & v_lose(e1) & n_people(x1))