问答题If each of★ and ◆ can be replaced by +, -, or ×, how many different values are there for the expression 2 ★ 2 ◆ 2?

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问答题
If each of★ and ◆ can be replaced by +, -, or ×, how many different values are there for the expression 2 ★ 2 ◆ 2?
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