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These problems deal with sequences of numbers. Can you spot what the sequences' rules are?

The sequence a_{1} , a_{2} , a_{3} ..., of integers has the property that for all n ≥ 3,
a_{n} =a_{n-1} -a_{n-2} .
If the sum of the first 1807 terms is 1807 and the sum of the first 1907 terms is 1907, what
is the sum of the first 2016 terms?

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