**Problem**

Return the sum of the numbers in the array, except ignore sections of numbers starting with a `6`

and extending to the next `7`

**(every 6 will be followed by at least one 7)**.

**Example**

solution([1, 2, 2]) → 5

solution([1, 2, 2, 6, 99, 99, 7]) → 5

solution([1, 1, 6, 7, 2]) → 4

Contributed by Erkan Ercan

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