What does this produce?
result = {x: x**2 for x in range(4)} print(result)
{0: 0, 1: 1, 2: 4, 3: 9}
{1: 1, 2: 4, 3: 9, 4: 16}
{0: 0, 1: 2, 2: 4, 3: 6}
Error
