A group of climbers rest on a summit that overlooks another mountain range.
A group of people are swimming in a lake.
A group climbers can either rest on a summit, or be swimming in a lake, the same group cannot be doing both at the same time.
exists e1 x1 x2 x3 x4 x5 x6 x7 x8.(a_topic(x1) & on(x1,x4) & Theme(e1,x8) & Actor(e1,x5) & v_overlook(e1) & n_range(x8) & of(x8,x7) & n_mountain(x7) & -(x8 = x6) & n_range(x6) & of(x6,x7) & (x4 = x5) & n_summit(x4) & of(x1,x2) & n_rest(x2) & of(x2,x3) & n_climber(x3) & n_group(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_lake(x3) & Actor(e1,x1) & v_swim(e1) & of(x1,x2) & n_people(x2) & n_group(x1))