deletions | additions       diff --git a/layout.md b/layout.md  index 73b2c67..0406047 100644  --- a/layout.md  +++ b/layout.md 
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chapter_1_Cryptography_from_Ancient__.tex  section_Encryption_or_Encoding_First__.tex  section_Simple_Substitution_Cipher_The__.tex  section_Symmetric_Ciphers_Let_s__.tex section_Asymmetric_Ciphers_To_set__.tex