no ...
no - either sentry could be guarding either door
i think we all know you are the main man in this forum, bruce - i'm just trying to handicap you with a couple of days' delay before you post the correct answer, as always!
the trouble with these threads, or at least the way i have mine set up anyway, is that while you are reading the question you can see other's answers
maybe we should use different threads for the answers?
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