A man and a child in the water, swimming.
the woman swam alone
Must be a man and a child or a woman, cannot be both.
exists s1 x1 x2 x3 x4.(n_water(x3) & a_topic(s1) & subset_of(x2,s1) & in(x2,x3) & rel(x3,x4) & n_swimming(x4) & n_child(x2) & subset_of(x1,s1) & n_man(x1))
exists x1 x2.(n_swam(x1) & of(x1,x2) & n_woman(x2) & a_topic(x1) & r_alone(x1))