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--- References to 開 [open]
→ 開く aku to open (intr.) Ref. 開 [open]
→ 開ける akeru to open (tr.) | undo Ref. 開 [open]
開始 kaishi inauguration 始 [begin]  Ref. 開 [open]
開始する kaishi suru open | inaugurate Ref. 開 [open]