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  1. or download this
    plaintext:   abcdef
ciphertext:  nopqrs
  2. or download this
    tr/A-Z/N-ZA-M/;
  3. or download this
    #        1         2         3         4
# 3456789 123456789 123456789 123456789 123456
($n,$_)=@ARGV;split//;print chr(ord()+$n)for@_