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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 fragment_search(self, fragement:str) -> List[dict]:
        ''' Returns the rows in InterLex associated with the fragment

        Note:
            Pressumed to have duplicate fragements in InterLex
        Args:
            fragment: The fragment_id of the curie pertaining to the ontology
        Returns:
            None or List[dict]
        '''
        fragement = self.extract_fragment(fragement)
        ilx_rows = self.fragment2rows.get(fragement)
        if not ilx_rows:
            return None
        else:
            return ilx_rows