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[–] ardvarcus 0 points 1 points (+1|-0) ago 

This is meaningless. You can categorize any subject into as many divisions as you want. For example, I can divide all novels into two categories -- novels with a romance, and novels without a romance. This twofold division embraces all novels that have ever been written. It's just a mental exercise.

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[–] captbrogers 0 points 1 points (+1|-0) ago 

I recommend looking into The Hero With A Thousand Faces by Joseph Campbell

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[–] WhiteRonin 0 points 0 points (+0|-0) ago 

A film major told me about this over 3 decades ago. Oh right! BBC (big black cocks!)