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--- References to 許 [authorization]
→ 許す yurusu to allow Ref. 許 [authorization]
許可 kyoka permission | approval | authorization   Ref. 可 [capable]
→ 許可 する kyoka suru to allow | to permit | to authorize Ref. 可 [capable]
免許 menkyo license | permit   Ref. 免 [exempt]