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Tiny, heroic Levi whose title is "humanity's strongest soldier" in his rare, funny, tragic, priceless moments. There's beautiful pictures of him as well as pictures of his eccentricities: the strange way he holds his tea cup, his cleaning obsession, some of his skanky toilet humor, the way he always seems to know who is at the door. His subordinates describe him as surprisingly tense, rude, and unapproachable yet everyone has a soft spot for Levi.
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The phrase that is in common use is "if worse comes to worse," which conveys the idea of an ever worsening situation.
"Worse comes to worst" is probably used because translators reason that "worse comes to worst" makes more sense.
They both make sense, but if I were you I'd write "worse comes to worse."
"Worst comes to worst" is completely wrong.