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def fib(n):     # write Fibonacci series up to n    a, b = 0, 1    while b < n:        print b,        a, b = b, a+bdef fib2(n):    # return Fibonacci series up to n    result = []    a, b = 0, 1    while b < n:        result.append(b)        a, b = b, a+b    return result