2
Input: 8 → [?] → 18, what is the rule? =
4
Input: 5 → [?] → 7, what is the rule? =
5
Input: 5 → [?] → 4, what is the rule? =
6
Input: 5 → [?] → 10, what is the rule? =
7
Input: 4 → [?] → 1, what is the rule? =
8
Input: 1 → [?] → 6, what is the rule? =