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--- コク KOKU
On-reading:
コク
as in
黒板
kokuban
Ref. 黒 [black]
On-reading:
コク
as in
黒板
kokuban
Ref. 板 [board]
On-reading:
コク
as in
国道
kokudō
Ref. 国 [country]
On-reading:
コク
as in
時刻
jikoku
Ref. 刻 [moment]