Mr. PB-- So why are there two copies of the same book? and where's the purple book-- it was just there yesterday?
I explained-- if you check a book out from this liberry you can return it at any of the x branches of the Liberry. That's why we have more than one copy of some books. Other books get checked out but don't get returned to this particular liberry. (I didn't say this, but some of them NEVER get returned-- imagine that!).
Mr. PB-- Well, that's just crooked!