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''Cirno and Reimu were strolling along the shore of the Misty Lake. Cirno said, “The frozen frogs float about so freely, following the current wherever it takes them. Such is the happiness of frog.”
Reimu said, “You are not a frog, so whence do you know the happiness of frog?”
Cirno said, “You are not I, so whence do you know I don’t know the happiness of frog?”
Reimu said, “I am not you, to be sure, so I don’t know what it is to be you. But by the same token, since you are certainly not a frog, my point about your inability to know the happiness of frog stands intact.”
Cirno said, “Let’s go back to the starting point. You said, ‘Whence do you know the happiness of frog?’ Since your question was premised on your knowing that I know it, I must have known it from here, beside the lake.”