What are X and Y?
7 8 6 9 5 1 0 X Y 3 12

X is 4; Y is 11
Two alternate series
Starting with the first number: 7 6 5 4 3
Starting with the second number: 8 9 10 11 12

What are X and Y?
7 8 6 9 5 1 0 X Y 3 12

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