The Passwords directory will hold a number of password lists that can be used by multiple tools when attempting to guess credentials for a given targetted service. This will include a number of very popular lists in cooperation with their maintainers, including the RockYou lists maintained by Rob Bowes.
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Password lists containing the count are located in the "withcount" folder. Lists over 100Mb have been compressed. merged.txt.tar.gz contains a merged list of all password lists in the "Password" directory; it has been sorted and uniq'd.