Finding the law of sequence 2 2 4 6 8 find the law, why, please specify

Finding the law of sequence 2 2 4 6 8 find the law, why, please specify

12, because the sum of every other number is the last number, that is, if 2 + 4 = 6, 2 + 6 = 8, so 4 + 8 = 12