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One might write all one's lines left to right, for example, or right to left, or write them vertically, beginning at one side or the other, and beginning at the top or bottom, or diagonally, beginning at any corner. - (Players of Gor, Chapter 12, Sentence #467)

This obviously contributes to the security of the communication". "These ciphers seem simple and beautiful," I said, "as well as powerful". "Too, if one wishes," he said, "one need not, in filling out the boards, do so as in the fashion of normal writing. One might write all one's lines left to right, for example, or right to left, or write them vertically, beginning at one side or the other, and beginning at the top or bottom, or diagonally, beginning at any corner. One might use alternate lines, or left or right spirals from given points, and so on. Similarly, after the initial entry the remainder of the alphabet could be written backwards, or beginning at a given point, or reversing alternate letters, and so on. These variations require only a brief informative addition to the key and the list of null squares, if any". - (Players of Gor)