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四価 / よんか : 1）tetravalent 2）quadrivalent
四囲 / しい : n vs 1）surroundings 2）circumference
四周 / ししゅう : n vs 1）periphery 2）circumference
四体 / したい : n arch 1）head, trunk, arms, and legs 2）the whole body
四千 / よんせん : n 1）four thousand P
四 / し / よ / よん / スー : 1）(num) four P 2）(num) four (chi:)
四つ / よっつ / よつ : 1）(num) four P
四国 / しこく : n 1）Shikoku (smallest of the four main islands of Japan)
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四価

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