Question: The Ckm wz. 30 was a Polish-made clone of what American heavy machine gun used by the United States in World War I, World War II, Korea and to a limited extent in Vietnam?
{'answer': 'The M1917 Browning machine gun', 'supporting_facts': [['Ckm wz. 30', 2], ['M1917 Browning machine gun', 0]]}