A group of people standing on a hillside decorated with yellow flowers as fog rolls over a nearby mountainside.
A group of ducks stands on a hillside.
group of people cannot be  group of ducks at the same time
exists e1 e2 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8.(with(e2,x5) & as(x5,x6) & over(x6,x8) & n_mountainside(x8) & a_nearby(s2) & Theme(s2,x8) & n_roll(x6) & of(x6,x7) & n_fog(x7) & n_flower(x5) & a_yellow(s1) & Theme(s1,x5) & Theme(e2,x1) & v_decorate(e2) & of(x1,x2) & on(e1,x4) & n_hillside(x4) & Actor(e1,x3) & v_stand(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(on(e1,x3) & n_hillside(x3) & Actor(e1,x1) & v_stand(e1) & of(x1,x2) & n_duck(x2) & n_group(x1))