13, 19, 22, ?, 12, 14?

can any one solve this problem? or:can any one solve this problem?or:The answer should be '8'.or:It could be anything so I'd need more info.

can any one solve this problem?

or:can any one solve this problem?

or:The answer should be '8'.

or:It could be anything so I'd need more info.

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