A group of mountain climbers
A group of climbers are outside
Mountain climbers would need to be outside to climb a mountain.
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & n_climber(x2) & of(x2,x3) & n_mountain(x3) & n_group(x1))
exists s1 x1 x2.(Theme(s1,x1) & a_outside(s1) & of(x1,x2) & n_climber(x2) & n_group(x1))