Adds relationship connection in Interlex

        A relationship exists as 3 different parts:
            1. entity with type term, cde, fde, or pde
            2. entity with type relationship that connects entity1 to entity2
                -> Has its' own meta data, so no value needed
            3. entity with type term, cde, fde, or pde

def delete_relationship(
        self,
        entity1_ilx: str,
        relationship_ilx: str,
        entity2_ilx: str) -> dict:
        """ Adds relationship connection in Interlex

        A relationship exists as 3 different parts:
            1. entity with type term, cde, fde, or pde
            2. entity with type relationship that connects entity1 to entity2
                -> Has its' own meta data, so no value needed
            3. entity with type term, cde, fde, or pde
        """

        entity1_data = self.get_entity(entity1_ilx)
        if not entity1_data['id']:
            exit(
                'entity1_ilx: ' + entity1_data + ' does not exist'
            )
        relationship_data = self.get_entity(relationship_ilx)
        if not relationship_data['id']:
            exit(
                'relationship_ilx: ' + relationship_ilx + ' does not exist'
            )
        entity2_data = self.get_entity(entity2_ilx)
        if not entity2_data['id']:
            exit(
                'entity2_ilx: ' + entity2_data + ' does not exist'
            )

        data = {
            'term1_id': ' ', #entity1_data['id'],
            'relationship_tid': ' ', #relationship_data['id'],
            'term2_id': ' ',#entity2_data['id'],
            'term1_version': entity1_data['version'],
            'term2_version': entity2_data['version'],
            'relationship_term_version': relationship_data['version'],
            'orig_uid': self.user_id, # BUG: php lacks orig_uid update
        }

        entity_relationships = self.get_relationship_via_tid(entity1_data['id'])
        # TODO: parse through entity_relationships to see if we have a match; else print warning and return None

        relationship_id = None
        for relationship in entity_relationships:
            if str(relationship['term1_id']) == str(entity1_data['id']):
                if str(relationship['term2_id']) == str(entity2_data['id']):
                    if str(relationship['relationship_tid']) == str(relationship_data['id']):
                        relationship_id = relationship['id']
                        break
        if not relationship_id:
            print('''WARNING: Annotation you wanted to delete does not exist ''')
            return None

        url = self.base_url + 'term/edit-relationship/{id}'.format(id=relationship_id)

        output = self.post(
            url = url,
            data = data,
        )

        return output