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にちがいない 【に違いない】
  1. -Expressions (phrases, clauses, etc.)I am sure; no doubt that; must; must have (done)
あそこ建物燃えているに違いないThat building must be on fire.
そうIT業界宵っ張り多いに違いないI'm one too, and I'm sure there are lots of night-owls in the IT world.
まさかオレごねずすっきり起きる思っていなかったに違いないCertainly she wouldn't have dreamt that I would get up promptly without grumbling.
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