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Jul 11, 2012 at 0:28 comment added nagytech Thanks, you spotted the key issue where I need to emphasise the existence of no other entrances. I didn't pick up on the possibility that the number of entrances could be implied, good point. I don't know why I'm being so pedantic about this one sentence.
Jul 10, 2012 at 19:13 history answered James Waldby - jwpat7 CC BY-SA 3.0