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--- References to 速 [fast]
→ [aj] 速い hayai fast | rapid Ref. 速 [fast]
→ 速める hayameru to accelerate | speed up Ref. 速 [fast]
速さ hayasa speed   Ref. 速 [fast]
速度 sokudo rate | velocity   Ref. 速 [fast]
早速 sassoku immediately | at once   Ref. 速 [fast]