Someone riding a bicycle is up in the air over a dirt and hill trail.
A man is lost in the forest with no form of transportation.
Someone up in the air cannot be lost in the forest same time.
exists e1 p1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(n_air(x8) & over(p1,x4) & n_trail(x6) & of(x6,x7) & n_hill(x7) & n_dirt(x5) & subset_of(x6,x4) & subset_of(x5,x4) & a_up(s1) & Manner(p1,s1) & in(x1,x8) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bicycle(x3) & (x1 = x2) & n_person(x1))
exists e1 x1 x2.(n_forest(x2) & -exists x3 x4.(in(e1,x2) & with(x2,x3) & of(x3,x4) & n_transportation(x4) & n_form(x3)) & Theme(e1,x1) & v_lose(e1) & n_man(x1))