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            return True
        return False
    def isValid (self, sWord):
        "checks if <sWord> is valid (different casing tested if the first letter is a capital)"
        if not sWord:
            return None
        if "’" in sWord: # ugly hack
            sWord = sWord.replace("’", "'")
        if self.lookup(sWord):
            return True
        if sWord[0:1].isupper():
            if len(sWord) > 1:
                if sWord.istitle():
                    return self.lookup(sWord.lower())
                if sWord.isupper():
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            return True
        return False
    def isValid (self, sWord):
        "checks if <sWord> is valid (different casing tested if the first letter is a capital)"
        if not sWord:
            return None
        if "'" in sWord: # ugly hack
            sWord = sWord.replace("'", "’")
        if self.lookup(sWord):
            return True
        if sWord[0:1].isupper():
            if len(sWord) > 1:
                if sWord.istitle():
                    return self.lookup(sWord.lower())
                if sWord.isupper():
 |