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One mask is 70% efficient, three masks is 90% efficient, cover your whole face in plastic wrap (no holes then it wont work!) and its 100% efficient!
@dv8 bonus points for knowing that phrase!
@freemo I'm having a heckava time locating the points vendor! 
@freemo what if I use 4 masks?
@freemo And then we breathe through the gaps at the sides... 🙄
@freemo It's masks, all the way down!