A pack of Pugs.
There is a pack of german shepherds.
there can either be a pack of pugs or German shepherds at the same time
exists x1 x2.(a_topic(x1) & of(x1,x2) & n_pug(x2) & n_pack(x1))
exists p1 x1 x2 x3 x4.((x1 = x2) & of(x2,x3) & n_shepherd(x3) & of(x3,x4) & n_german(x4) & n_pack(x2))