Returns the chunks for a certain type
        @type chunk_type: string
        @param chunk_type: type of the chunk
        @rtype: list
        @return: the chunks for that type

def get_chunks(self,chunk_type):
        """
        Returns the chunks for a certain type
        @type chunk_type: string
        @param chunk_type: type of the chunk
        @rtype: list
        @return: the chunks for that type
        """
        for nonter,this_type in self.label_for_nonter.items():
            if this_type == chunk_type:
                subsumed = self.terms_subsumed_by_nonter.get(nonter)
                if subsumed is not None:
                    yield sorted(list(subsumed))