Chinese

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one; single; a
one; single; a; (before verbs) as soon as, once; (before a noun) entire (family, etc.)
 
rank or step; stairs
trad. (一階邏輯) 邏輯
simp. (一阶逻辑) 逻辑
 
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Noun

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一階邏輯

  1. (logic) first-order logic