Po had lost his sight eight years ago. He could not read words on paper, for while the part of his Grace that allowed him to sense the physical world around him compensated for many aspects of his blindness, he had trouble demystifying differences on flat surfaces, and he could not sense color. He wrote in large letters with a sharp piece of graphite, because graphite was easier to control than ink, and he wrote with a ruler as a guide, since he could not see what he was writing. He also used a small set of movable wooden letters as a reference to help him keep his own ciphers straight in his
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