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I would completely advise against this, simply because chickens are flock animals, and will become heartbroken not having a friend.  I am sure the people wanting this bird have no idea what will happen with one bird.  It will cry, not lay, become morose.....
I recently went through this with my turkeys.  One male one female, the female passed, and the male refused to eat and finally passed on.  They do not live long without another of their kind.