An old man wearing gray sleeps in a small chair .
It is impossible that an old man wearing gray sleeps in a small chair that is massaging his back .
It is impossible that an old man wearing gray sleeps in a small chair that is massaging his back .
It is certain that an old man wearing gray sleeps in a small chair that is massaging his back .
An old man wearing gray sleeps in a small chair that is massaging his back .