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EXAMPLE
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[10] is the smallest available integer having a "0". [1] is the smallest available integer having a "1" or a "0". [11] is the smallest integer having a 1, etc.
When restricted to {0..9999} this sequence is a permutation with the following cycle representation:
(1, 10, 23, 27, 19, 6, 20, 16, 5, 2)
(3, 11, 22, 7, 21, 17, 25, 8, 13, 4, 12, 24, 28, 9)
(18, 26)
(30, 32, 31)
(40, 43, 42, 41)
(50, 54, 53, 52, 51)
(60, 65, 64, 63, 62, 61)
(70, 76, 75, 74, 73, 72, 71)
(80, 87, 86, 85, 84, 83, 82, 81)
(100, 109, 108, 107, 106, 105, 104, 103, 102, 101)
(200, 201)
(300, 302, 301)
(400, 403, 402, 401)
(500, 504, 503, 502, 501)
(600, 605, 604, 603, 602, 601)
(700, 706, 705, 704, 703, 702, 701)
(800, 807, 806, 805, 804, 803, 802, 801)
(1000, 1009, 1008, 1007, 1006, 1005, 1004, 1003, 1002, 1001)
(2000, 2001)
(3000, 3002, 3001)
(4000, 4003, 4002, 4001)
(5000, 5004, 5003, 5002, 5001)
(6000, 6005, 6004, 6003, 6002, 6001)
(7000, 7006, 7005, 7004, 7003, 7002, 7001)
(8000, 8007, 8006, 8005, 8004, 8003, 8002, 8001)
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