A man and woman are on a gray and white rowboat.
There are people on a rowboat.
Here people refers to man and woman on a gray and white rowboat.
exists p1 x1 x2 x3.(exists s1 s2 x4.(on(x1,x4) & n_rowboat(x4) & a_white(s2) & Theme(s2,x4) & a_gray(s1) & Theme(s1,x4)) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1))
exists p1 x1 x2 x3.((x1 = x2) & on(x2,x3) & n_rowboat(x3) & n_people(x2))