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a barber learns to shave by shaving fools
01
床屋は愚か者の髭を剃ることで髭を剃ることを学ぶ
used to emphasize the importance of practice and experience in developing expertise, and the value of learning from mistakes
例
Don't criticize the new intern so harshly, remember the saying - a barber learns to shave by shaving fools.
