An diofar eadar na mùthaidhean a rinneadh air "840an"

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b robot Adding: kv:840-ӧд вояс
Loidhne 41:
[[ko:840년대]]
[[ksh:840-er Joohre]]
[[kv:840-ӧд вояс]]
[[la:Decennium 85]]
[[mk:840-ти]]