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1from e30_flatten_list import flatten 

2import pytest 

3 

4 

5@pytest.mark.parametrize('nested, output', [ 

6 ([[10, 20, 30]], [10, 20, 30]), 

7 ([[10, 20], [30, 40]], [10, 20, 30, 40]), 

8]) 

9def test_flatten(nested, output): 

10 assert flatten(nested) == output