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階差 かいさ数列 すうれつでした
kaisa sūretsudeshita

敬
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Noun
, 
Desu Copula

The polite past form of 階差数列

1. It was a difference sequence.; It was a staircase sequence.

Past/Perfective
, 
Polite
, 
Mathematics

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階差数列でした

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