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I don't understand you... Why does a hydra have to lose its head in order to start eating? If it lost its head, when did it happen? And finally, if it really did lose its head, it should now have 3 heads instead of 2 (two new ones grew in place of the one it lost, at the expense of the one point of satiety it had initially). Isn't that right?
I missed the part about the point of satiety; I should ask Ment.