deletions | additions       diff --git a/layout.md b/layout.md  index db165a7..8559c63 100644  --- a/layout.md  +++ b/layout.md 
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section_Simple_Substitution_Cipher_The__.tex  section_Symmetric_Ciphers_Let_s__.tex  section_Asymmetric_Ciphers_To_set__.tex  chapter_2_Discrete_Logarithm_Problems__.tex section_Diffie_Hellman_Key_Exchange__.tex