In Hepburn romanization, when an "n" character is followed by an m, b or (hardened "b" sound) p, the n is romanized to "m" because that's how it _actually sounds_ in spoken Japanese.
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In Hepburn romanization, when an "n" character is followed by an m, b or (hardened "b" sound) p, the n is romanized to "m" because that's how it _actually sounds_ in spoken Japanese.
--for the record. :-)