A man and a woman next to some yellow taxis.
Nobody is near taxis
either a man and woman are next to taxis or nobody is
exists s1 s2 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & to(x3,x4) & n_taxi(x4) & a_yellow(s2) & Theme(s2,x4) & next(x2,x3) & n_thing(x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
-exists p1 x1.(exists x2.(near(x1,x2) & n_taxi(x2)) & n_person(x1))