How does the rare combination of a supermoon, blue moon & blood moon happen?

As people are getting the special opportunity to enjoy not only a blue moon and a supermoon, but also a total lunar eclipse, all rolled into one, many may be asking how this rare event occurs? Here's an explanation of it. 

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(Source: CGTN, https://www.youtube.com/watch?v=xA2enpY5618)