A young man is looking and thinking at the same time.
A young man is using substances to clear his mind of any thoughts.
The man is either looking and thinking, or using substances. If the substances clear his mind of any thoughts, he cannot be thinking.
exists e2 e1 s1 s2 s3 x1 x2 x3.(n_time(x3) & a_same(s3) & Theme(s3,x3) & at(e2,x3) & Actor(e2,x2) & v_think(e2) & n_man(x2) & a_young(s2) & Theme(s2,x2) & Actor(e1,x1) & v_look(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 p1 s1 x1 x2 x3.(Theme(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_use(e1) & all x4.(n_thought(x4) -> exists e2.(Theme(e2,x3) & Actor(e2,x1) & v_clear(e2) & of(x3,x4))) & n_mind(x3) & of(x3,x1) & n_male(x1) & n_substance(x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))