Here is a paper on how to make your own respiratory mask using a Hanes t-shirt. It provides some decent protection--not as good as N95, but better than nothing. Much of its protection is dependent upon fit.
Obviously, wash in bleach and dry between excursions.
https://www.ncbi. .nih.gov/pmc/articles/PMC3373043/
The fingers given are the server changing the letters n l m
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"When the Know-Nothings get control, it will read 'all men are created equal, except negroes, and foreigners, and Catholics.' When it comes to this I should prefer emigrating to some country where they make no pretense of loving liberty – to Russia, for instance, where despotism can be taken pure, and without the base alloy of hypocrisy.”--Abraham Lincoln
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