1 -> 2 -> 3 -> 4 -> 5 -> 6
1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7
1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7 * => 8
^ examples; and some samples
1 2 2 1 2 3
3 3 2 1 1 1
1 2 4 1 3 2
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