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challenge [challenges]▼(difficult task)noun[UK: ˈtʃæ.ləndʒ] [US: ˈtʃæ.ləndʒ]
problem [problems]▼(difficulty)noun[UK: ˈprɒ.bləm] [US: ˈprɑː.bləm]
puzzle [puzzles]▼(anything difficult to understand or make sense of)noun[UK: ˈpʌz.l̩] [US: ˈpʌz.l̩]
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