A man and a woman in front of the yellow flowers.
A man and woman sit against a concrete wall.
The people can't be in front of yellow flowers while against a concrete wall.
exists s1 s2 x1 x2 x3 x4.(n_flower(x4) & a_yellow(s2) & Theme(s2,x4) & a_topic(s1) & subset_of(x2,s1) & in(x2,x3) & of(x3,x4) & n_front(x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists e1 s1 x1 x2 x3 x4.(against(e1,x4) & n_wall(x4) & a_concrete(s1) & Theme(s1,x4) & Actor(e1,x1) & v_sit(e1) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1))