A group of guys on the beach.
A group of ladies are on the beach together.
A group of guys can't be a group of ladies.
exists x1 x2 x3.(n_beach(x3) & a_topic(x1) & of(x1,x2) & on(x2,x3) & n_guy(x2) & n_group(x1))
exists p1 s1 x1 x2 x3.(n_beach(x3) & a_together(s1) & Manner(p1,s1) & on(x1,x3) & of(x1,x2) & n_lady(x2) & n_group(x1))