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Setup a fence around a basketball goal that has holes the size of a beachball. Try to shoot basket now. Does it 100% prevent you from making baskets? No. Does it make it more difficult to make them? Yes
Same principle of wearing the mask. Does it prevent the spread 100% No, but it does make it more difficult as even though the droplets may be small enough to get through there is still a high chance of it hitting the fibers and not passing through.
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