def test_2_3_diff1(): assert big_diff([2, 3]) == 1
def test_2_2_diff0(): assert big_diff([2, 2]) == 0
def test_10_2_diff8(): assert big_diff([10, 2]) == 8
def test_10_0_diff10(): assert big_diff([10, 0]) == 10
def test_2_10_7_2_diff8(): assert big_diff([2, 10, 7, 2]) == 8
def test_2_10_diff8(): assert big_diff([2, 10]) == 8
def test_7_2_10_9_diff8(): assert big_diff([7, 2, 10, 9]) == 8
def test_10_3_5_6_diff8(): assert big_diff([10, 3, 5, 6]) == 7
def test_7_7_6_8_5_5_6_diff3(): assert big_diff([7, 7, 6, 8, 5, 5, 6]) == 3
def test_7_6_8_5_diff3(): assert big_diff([7, 6, 8, 5]) == 3
def test_5_1_6_1_9_9_diff8(): assert big_diff([5, 1, 6, 1, 9, 9]) == 8