There is a grown duck and several baby ducks.
The group of birds are chickens.
The birds are either ducks or chickens.
exists p1 x1 s1 s2 x2 x3 x4 x5.((x1 = x2) & subset_of(x4,x2) & n_duck(x4) & of(x4,x5) & n_baby(x5) & a_several(s2) & Theme(s2,x4) & subset_of(x3,x2) & n_duck(x3) & a_grown(s1) & Theme(s1,x3))
exists p1 x1 x2.(n_group(x1) & exists x3.((x1 = x3) & n_chicken(x3)) & of(x1,x2) & n_bird(x2))