I think this is the kind of question that can truly be understood by attempting to collect over a long period of time. Its kind of like (but even more complicated) trying to complete a set of a famous ball player with an extensive list of cards. You start out knowing the basics by collecting the known, conventional wisdom, but as you go through it, you find out more and more that is virtually unknown leading you to deeper rabbit holes. It is one hell of an interesting attempt that surely would be tremendously rewarding to a collector.
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