hi, here is my script so far to make rainbow tables

require 'digest/md5'
string = "a"
File.open("rainbow.txt", "a") do |f|
while string != "zzzzzzzz"
md5 = Digest::MD5.hexdigest(string)
    f.puts string + " : " + md5
    string = string.next
end
end

but string only goes into lowercase characters

i.e
z > aa
i want it to do
z > A

thanks...
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