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1 5 2 8 12 9 15
1 to 5: +4
5 to 2: -3
2 to 8: +6
8 to 12: +4
12 to 9: -3
9 to 15: +6
15 to ?: +4

Thus, the looping sequence of operations between terms is: +4, -3, +6.

Just add 4 to 15 to find the answer, 19.

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