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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def is_searchable(self):

 """A bool value that indicates whether the name is a valid name to 
 search by."""

        first = alpha_chars(self.first or u'')
        last = alpha_chars(self.last or u'')
        raw = alpha_chars(self.raw or u'')
        return (len(first) >= 2 and len(last) >= 2) or len(raw) >= 4