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You're right, they definitely should be four separate answers.

Personally I don't like community wiki. Design by committee rarely works, and a community wiki answer is no exception. You generally get a reasonable repository of information, but then inevitably ...

I've split it into four new answers and deleted the old one.

I understand the motivation for community wiki - it invites collaboration. However, useful collaboration doesn't happen very often, and there isn't actually a site privilege requirement that makes it ...