def METHOD_NAME(properties: Properties) -> None:
    store = properties.store
    items = dict(itertools.islice(properties.items, 10))
    for key, value in items.items():
        store.set(key, value)
    missing_keys = set(itertools.islice(properties.keys, 5))
    all_keys = list(items.keys() | missing_keys)
    # Test reading a combination of present and missing keys.
    assert dict(store.get_many(all_keys)) == items
    # Test deleting a combination of present and missing keys.
    store.delete_many(all_keys)
    assert dict(store.get_many(all_keys)) == {}