3216 ⇒ 3 + 2 + 6 - 1 ⇒ 102338 ⇒ 2 + 3 + 8 - 3 ⇒ 103235 ⇒ 3 + 2 + 5 - 0 ⇒ 102015 ⇒ 2 + 0 + 5 - 1 ⇒ 6Therefore, 2015 is different from the other three.
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