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I googled the tattoo and saw that she has "должно быть" as the first line and "чтотобольшее" right beneath it, yes, exactly like that "чтотобольшее", as one word, no spaces. I've also noticed that...

I tried to fit that sentence in my head, but I ultimately couldn't. IMO, this doesn't make sense and will throw off any Russian speaker who'd hear that. If I wanted to convey the meaning you gave us...