How many genders exist?

Okay, so not to be offensive...
but I have heard it claimed by many (even leading authorities on the issue) that dozens, if not HUNDREDS of genders exist?

How many genders exist?
and can you name any genders outside of Male and Female and Non Binary (aka, None of the Above)? <--- I would consider Transmen/Transwomen are Male and Female (is that not what they claim anyways?)...
but what are the names of genders that exist outside of those?

How many genders exist?
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