A man is sitting on a couch under an expressway ledge .
It is probably not the case that a homeless man is sitting on a couch under an expressway ledge .
We believe that a homeless man is sitting on a couch under an expressway ledge .
It is probably not the case that a homeless man is sitting on a couch under an expressway ledge .
A homeless man is sitting on a couch under an expressway ledge .