Young men are rocking out on stage.
The men are old.
The men are young and therefore cannot be old.
exists e1 s1 s2 x1 x2.(a_out(s2) & Manner(e1,s2) & on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_rock(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists s1 x1.(n_man(x1) & Theme(s1,x1) & a_old(s1))