$$f(x) = \frac1x$$
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While the protagonist, , was fighting through hordes of monsters in the campaign to save the world from a mysterious portal, the scientists were developing a secret weapon: the Automatic Injector . It wasn't just a gun; it was designed to deliver a potent antidote directly into the bloodstream of mutants to reverse the infection. The Chaos of the Mutants pixel gun 3d injector