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Warning: this is going to get complicated.
You've stumbled upon the Overly Complex Meeting Theory, a behemoth of a concept that will leave you questioning everything you thought you knew about the nature of human interaction.
According to our research (which we're pretty sure is totally valid), there are 17 different types of meetings, each with its own unique sub-theory, sub-sub-theory, and sub-sub-sub-theory.
Here's a breakdown:
Proceed with caution (and a strong stomach for complexity).