How To Hybrid Attack Dict + Dict + Dict

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combinator3.bin from hashcat-utils. Or, if you want GPU acceleration, make a rule file out of the 3rd wordlist and pipe combinator.bin into oclHashcat and run with -r thirdwordlist.rule or something. Or if the first two wordlists are small enough you could combinator.bin those and run with -a 1 against the third wordlist. The tools are all there, just have to use your brain.