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Zen students are with their masters at least ten years before they presume to teach others. Nan-in was visited by Tenno, who, having passed his apprenticeship, had become a teacher. The day happened to be rainy, so Tenno wore wooden clogs and carried an umbrella. After greeting him Nan-in remarked: ‘I suppose you left your wooden clogs in the vestibule. I want to know if your umbrella is on the right or left side of the clogs.’