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Old Jun 5, 2010, 02:57 AM
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Gigablah Gigablah is offline
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This might shed some light on the alphabet/year mapping:

http://shiningbrightly.blog.so-net.ne.jp/2009-12-01

1984 = N
1985 = I
1986 = H
1987 = O
1988 = R
1989 = E
1990 = C
1991 = D

Supposedly it follows the order of the unique characters in "NIHON RECORD", switching to regular numbers after 1991.
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