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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 find(self, name=None, **attrs):
 r"""First descendant node matching criteria. Returns None if no descendant node found. :return: descendant node matching criteria :rtype: Union[None,TexExpr] \textit{eee} """

        try:
            return next(self.find_all(name, **attrs))
        except StopIteration:
            return None