A boy holds a picture over his head.
Boy is looking at the mirror
The boy either holds a picture or is looking at the mirror, but not both.
exists e1 x1 x2 x3.(over(e1,x3) & n_head(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_picture(x2) & n_boy(x1))
exists e1 x1 x2.(n_mirror(x2) & ne_nam_boy(x1) & at(e1,x2) & Actor(e1,x1) & v_look(e1))