def gen_fib_tree(nums: list):
    print(' '.join(f'f({i})' for i in nums))
    if all(i < 2 for i in nums):
        return

    temp = []
    for i in range(len(nums)):
        if nums[i] < 2:
            temp.append(nums[i])
        else:
            temp.extend([nums[i] - 1, nums[i] - 2])
    return gen_fib_tree(temp)