Combining problems in Python

I tried to solve the combination problem in Python, but I can't think of a good way. .. ..

letter = ["A","B","C"]

for i in range(3):
	for j in range(3):
		for k in range(3):
			print letter[i], letter[j], letter[k]

This is too childish, and the length of the list increases. .. ..

So, when I looked it up, there was a useful library.

import itertools

letter = ["A","B","C"]
for i in itertools.product(letter, repeat=len(letter)):
	print i

This only took a few lines.

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