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I take the number-alphabet, the great mnemonic device for recollecting numbers and dates. In this system each digit is represented by a consonant, thus: 1 is t or d; 2, n; 3, m; 4, r; 5, l; 6, sh, j, ch, or g; 7, c, k, g, or qu; 8, f or v; 9, b or p; 0, s, c, or z. Suppose, now, you wish to remember the velocity of sound, 1,142 feet a second: t, t, r, n, are the letters you must use.