a girl and a woman ride a camel.
A girl and her mother ride on a camel.
the fact that a girl and a woman are riding a camel does not imply that the woman is her mother.
exists s1 x1.(a_topic(s1) & all x2.(n_camel(x2) -> exists x3 x4.(subset_of(x3,s1) & for(x3,x2) & n_ride(x3) & of(x3,x4) & n_woman(x4))) & subset_of(x1,s1) & n_girl(x1))
exists s1 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & on(x2,x4) & n_camel(x4) & n_ride(x2) & of(x2,x3) & n_mother(x3) & of(x2,x1) & n_female(x1) & subset_of(x1,s1) & n_girl(x1))