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1)
#3,362

Inflections of 困難

Common
Meaning
    1. difficulty; hardship; trouble; distress
      I found it difficult to understand what he was saying.
    2. infeasibility; inability (to carry out)
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2)
#34,254

Inflections of 困難を極める

Meaning
    1. to be extremely difficult; to present a major challenge
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