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def f(s):len({2<<s.count(c)-2for c,in s})<2or{{e.dil:-tu,r.dil:-tu,}} Output is via presence or absence of an error. The error is either a ValueError (one or more characters occur only once) or a NameError (the character counts are unequal).
def f(s):len({2<<s.count(c)-2for c,in s})<2or{{e.dil:-tu,r.dil:-tu,}} Output is via presence or absence of an error. The error is either a ValueError (one or more characters occur only once) or a NameError (the character counts are unequal).
def f(s):len({2<<s.count(c)-2for c,in s})<2or{{e.dil:-tu,r.dil:-tu,}} Output is via presence or absence of an error. The error is either a ValueError (one or more characters occur only once) or a NameError (the character counts are unequal).
def f(s):len({2<<s.count(c)-2for c,in s})>1<<2or{{ddeiillorrttuue.dil:-1tu,r.>>dil:-2.tu,}:1,} Output is via presence or absence of an error. The error is either a ValueError (one or more characters occur only once) or a TypeErrorNameError (the character counts are unequal).
def f(s):len({2<<s.count(c)-2for c,in s})>1<{{ddeiillorrttuu:-1.>>-2.,}:1,} Output is via presence or absence of an error. The error is either a ValueError (one or more characters occur only once) or a TypeError (the character counts are unequal).
def f(s):len({2<<s.count(c)-2for c,in s})<2or{{e.dil:-tu,r.dil:-tu,}} Output is via presence or absence of an error. The error is either a ValueError (one or more characters occur only once) or a NameError (the character counts are unequal).
def f(s):len({2<<s.count(c)-2for c,in s})>1<{{ddeiillorrttuu:-1.>>-2.,}:1,} Output is via presence or absence of an error. The error is either a ValueError (one or more characters occur only once) or a TypeError (the character counts are unequal).