A skull of rowers on a lake.
A group of male rowers are on the lake.
Not all rowers are male.
exists x1 x2 x3.(a_topic(x1) & of(x1,x2) & on(x2,x3) & n_lake(x3) & n_rower(x2) & n_skull(x1))
exists p1 s1 x1 x2 x3.(n_lake(x3) & on(x1,x3) & of(x1,x2) & n_rower(x2) & a_male(s1) & Theme(s1,x2) & n_group(x1))