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Noun
A
type
that
efficiently
filters
out
99
%
of
airborne
of
0
.
3
(
and
all
larger
particles
),
but
which
is
not
resistant
to
oils
.
Noun
;
Made with ♥ by Homo Sapiens on Planet Earth

Rejected by Y-Combinator. Definitions by Wiktionary.

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