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In a very dark night, a blind man, holding a lamp in his hand and carrying an earthen pot on his shoulder, was passing along the street. Somebody seeing him, said, "You blockhead! day and night are the same to you, of what use can a lamp be to you?"
The blind man, on hearing this, laughed and replied, "I do not carry this lamp for me but for you, as I think that in the dark you may knock against me, and throwing me on the ground break my pot."

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