Question: A classic children's toy consists of 11 different blocks that combine to form a rectangle showing a man's face. Each block has four sides with

A classic children's toy consists of 11 different blocks that combine to form a rectangle showing a man's face. Each block has four sides with alternatives for that part of the face; for example, the block for the right eye might have a closed eye on one side, a partially open eye on another, and so on. A child can turn any block and so change that part of the face, and in this way many different faces can be formed.

If a child makes one change each minute and spends 43 hours a week changing faces, how many years will it take to see every possible face?

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