A man is dancing before a band of musicians.
The man is dancing before a group of pigeons.
Band of musicians are different from  group of pigeons
exists e1 x1 x2 x3.(before(e1,x2) & of(x2,x3) & n_musician(x3) & n_band(x2) & Actor(e1,x1) & v_dance(e1) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & before(e1,x2) & of(x2,x3) & n_pigeon(x3) & n_group(x2) & Actor(e1,x1) & v_dance(e1))