Vigenere Key: 

abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyza
bcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz


Plaintext: 

cowardsdiemanytimesbeforetheirdeathsthevaliantnevertasteofdeathbutonceofallthew
ondersthatiyethavehearditseemstomemoststrangethatmenshouldfearseeingthatdeathane
cessaryendwillcomewhenitwillcomewilliamshakespearejuliuscaesarxxxxxxxxxxxxxxxxxx
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Ciphertext:

cpydviykqnwlzlhxcvkuyakocshfkuhjgapbdsqioayrfmhzrbpsatvhskjlicrmggccsvgyughqfdwp
pgiwyapjdtkrhwqmwayvnagssfgpwyutmvydffhgqeyxncwqkdntjryqjmmjbdqrwcwkztnyaxrgaogf
ixyhzhoypjwabtgfyrdblhtxkophutmfswxvobiysdynlbyqekwomzyjincldklmnopqrstuvwxyzabc
defghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcde
fghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefg
hijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghi
jklmnopqrstuvwxyzabcdefghijklmno