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Euclid's Elements (300 BC)
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In right-angled triangles the square on the side subtending the right angle is equal to the squares on the sides containing the right angle.
That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
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Reason transformed into prejudice is the worst form of prejudice, because reason is the only instrument for liberation from prejudice.
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Philip James Bailey
Letitia Elizabeth Landon