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超 ちょう巨大 きょだいブラックホールだった
chō kyodai burakkuhōrudatta

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Noun
, 
Da Copula

The past form of 超巨大ブラックホール

1. Was a supermassive black hole.

Past/Perfective
, 
Astronomy

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超巨大ブラックホールだった

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