def insert(self, el):
        return self.union(self._make_heap(el))
Test loading, validation and deletion of the demo collections.
dataset/ETHPy150Open kachayev/fn.py/fn/immutable/heap.py/PairingHeap.insert--crossover with--dataset/ETHPy150Open oppia/oppia/core/domain/collection_services_test.py/LoadingAndDeletionOfCollectionDemosTest.test_loading_and_validation_and_deletion_of_demo_collections