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20 -> 01 -> 13 -> 30 -> 01 -> 14 -> 40 -> 01 -> 15 -> 50 -> 01 -> 16 -> 60 -> 02 -> 21 -> 10 -> 02 -> 22 -> 20 -> 02 -> 23 -> 30 -> 02 -> 24 -> 40 -> 02 -> 25 -> 50 -> 02 -> 26 -> 60 -> 03 -> 31 -> 10 -> 03 -> 32 -> 20 -> 03 -> 33 -> 30 -> 03 -> 34 -> 40 -> 03 -> 35 -> 50 -> 03 -> 36 -> 60 -> 04 -> 41 -> 10 -> 04 -> 42 -> 20 -> 04 -> 43 -> 30 -> 04 -> 44 -> 40 -> 04 -> 45 -> 50 -> 04 -> 46 -> 60 -> 05 -> 51 -> 10 -> 05 -> 52 -> 20 -> 05 -> 53 -> 30 -> 05 -> 54 -> 40 -> 05 -> 55 -> 50 -> 05 -> 56 -> 60 -> 06 -> 61 -> 10 -> 06 -> 62 -> 20 -> 06 -> 63 -> 30 -> 06 -> 64 -> 40 -> 06 -> 65 -> 50 -> 06 -> 66 -> 61 -> 11 -> 11 -> 12 -> 21 -> 11 -> 13 -> 31 -> 11 -> 14 -> 41 -> 11 -> 15 -> 51 -> 11 -> 16 -> 61 -> 12 -> 22 -> 21 -> 12 -> 23 -> 31 -> 12 -> 24 -> 41 -> 12 -> 25 -> 51 -> 12 -> 26 -> 61 -> 13 -> 32 -> 21 -> 13 -> 33 -> 31 -> 13 -> 34 -> 41 -> 13 -> 35 -> 51 -> 13 -> 36 -> 61 -> 14 -> 42 -> 21 -> 14 -> 43 -> 31 -> 14 -> 44 -> 41 -> 14 -> 45 -> 51 -> 14 -> 46 -> 61 -> 15 -> 52 -> 21 -> 15 -> 53 -> 31 -> 15 -> 54 -> 41 -> 15 -> 55 -> 51 -> 15 -> 56 -> 61 -> 16 -> 62 -> 21 -> 16 -> 63 -> 31 -> 16 -> 64 -> 41 -> 16 -> 65 -> 51 -> 16 -> 66 -> 62 -> 22 -> 22 -> 23 -> 32 -> 22 -> 24 -> 42 -> 22 -> 25 -> 52 -> 22 -> 26 -> 62 -> 23 -> 33 -> 32 -> 23 -> 34 -> 42 -> 23 -> 35 -> 52 -> 23 -> 36 -> 62 -> 24 -> 43 -> 32 -> 24 -> 44 -> 42 -> 24 -> 45 -> 52 -> 24 -> 46 -> 62 -> 25 -> 53 -> 32 -> 25 -> 54 -> 42 -> 25 -> 55 -> 52 -> 25 -> 56 -> 62 -> 26 -> 63 -> 32 -> 26 -> 64 -> 42 -> 26 -> 65 -> 52 -> 26 -> 66 -> 63 -> 33 -> 33 -> 34 -> 43 -> 33 -> 35 -> 53 -> 33 -> 36 -> 63 -> 34 -> 44 -> 43 -> 34 -> 45 -> 53 -> 34 -> 46 -> 63 -> 35 -> 54 -> 43 -> 35 -> 55 -> 53 -> 35 -> 56 -> 63 -> 36 -> 64 -> 43 -> 36 -> 65 -> 53 -> 36 -> 66 -> 64 -> 44 -> 44 -> 45 -> 54 -> 44 -> 46 -> 64 -> 45 -> 55 -> 54 -> 45 -> 56 -> 64 -> 46 -> 65 -> 54 -> 46 -> 66 -> 65 -> 55 -> 55 -> 56 -> 65 -> 56 -> 66 -> 66 -> 60 -> 00 De Bruijn sequence : 00010020030040050060110120130140150160210220230240250260310320330340350360410420430440450460510 52053054055056061062063064065066111211311411511612212312412512613213313413513614214314414514615 21531541551561621631641651662223224225226233234235236243244245246253254255256263264265266333433 533634434534635435535636436536644454464554564654665556566600