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[a, b, c] => [1, 2, 3]
[b, c]    => [2, 3, 4, 5]
[a, c, d] => [4, 5, 6, 7]
[d]       => [1, 2, 6]

[a, b, c, d] => [1, 2]
[a, b, c]    => [3]
[a, b, c, d] => [4, 5]
[a, c, d]    => [6, 7]