Workers cutting and weighing fish.
The group is milking cows
The group of workers cannot be both cutting and weighing fish while milking cows at the same time.
exists e1 e2 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_weigh(e2) & n_fish(x4) & n_worker(x3) & Theme(e1,x2) & Actor(e1,x1) & v_cut(e1) & n_fish(x2) & n_worker(x1))
exists e1 x1 x2.(n_group(x1) & Theme(e1,x2) & Actor(e1,x1) & v_milk(e1) & n_cow(x2))