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[436d] and thenceforth forced all other names into agreement with his own initial error, there is nothing strange about that. It is just so sometimes in geometrical diagrams; the initial error is small and unnoticed, but all the numerous deductions are wrong, though consistent. Every one must therefore give great care and great attention to the beginning of any undertaking, to see whether his foundation is right or not. If that has been considered with proper care, everything else will follow.

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