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Chris Christensen Department of Mathematics and Statistics Northern Kentucky University

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CodebookAdditive Book

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Encipher “U.S. Navy”24396 Additive65358 False sum89644 Transmitted89644 Additive65358 “U.S. Navy”24396 Decipher

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67854 59199 76833 57699 10047 70863 06138 27924

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48677 26777 66476 09369 47063 29174 67495 14631 05421 75866 32209 56958 57000 99937 63523 31555

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3-digit Page Number | 1-digit Row Number | 1 –digit Column Number 02713

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67854 59199 76833 57699 10047 70863 06138 27924

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Is it possible to add two 5-digit numbers that are congruent to 2 modulo 3 and have the sum be a 5-digit number that is congruent to 0 modulo 3?

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Regular Sum False Sum

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(Codegroup + Additive) (Codegroup G + Additive) Codegroup – Codegroup G

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(Codegroup – Codegroup G) + Codegroup G Given these 9 differences Want to construct So that the sum scans

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Etc.

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