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___ [px] 最 sai
= Superlative Prefix 最
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最 Prefix the most ... ___
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最大[の] saidai[no] the maximum [of]  
最 [most]
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最良[の] sairyō[no] the best [of] | excellent  
最 [most]
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最悪[の] saiaku[no] the worst [of]  
最 [most]