Please see the sources at:

https://rygb.blogspot.com/2021/02/toras-purim-5781-part-1-corona.html

https://rygb.blogspot.com/2021/02/toras-purim-5781-part-2-corona.html

http://rygb.blogspot.com/2021/02/toras-purim-5781-part-3-corona.html

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