People walking on a trail in a tree filled park.
a group is sleeping
People cannot be walking and sleeping.
exists e2 e1 x1 x2 x3 x4 x5.(Theme(e2,x5) & Actor(e2,x1) & v_fill(e2) & n_park(x5) & in(e1,x4) & n_tree(x4) & on(e1,x3) & n_trail(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1))
exists e1 x1.(Actor(e1,x1) & v_sleep(e1) & n_group(x1))