IsIsogram without nested loops

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#1 
 for (int32 Index = 0; Index+1 < Word.Len(); Index++)
    {
        FString Temp = Word;
        Temp.RemoveAt(Index);
        if (Temp.GetCharArray().Contains(Word[Index]))
        {
            return false;
        }
    }
#2

not sure how FString::RemoveAt works by default (if it resizes the array or not, and how - if it does, I expect it’s by copying the elements one by one, which means more iterations). but even without considering that, doesn’t that Contains() method do iterations through the TCHAR array? I can’t really find documentation for that method, but I expect that’s how it works.

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