[quote=@Dedonus]
<Snipped quote by Terminal>

It was just a little joke.  Herakles did Twelve Labors instead ten because two of the original labors did not count, so in order to have ten labors that did count, Herakles needed to do two additional labors.  :D
[/quote]

Right, and the joke here is that each subsequent series leads to an increase of two Labours since the discounting and addition of two additional labours each time has become a tradition.