Re: mutual exclusivity
The penny started to drop when fim used a rather colourful example of a population that have either, both or neither penises or vaginas.
I think the easiest analogy he used was to imagine two sticks that create angles, AB is opposite A'B' so what happens to AB when A'B' is shortened?
At first I didn't understand how this applied to the question of mutual exclusivity, but now I do, thanks guys.
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