Closest hex to #668c1c is #682

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#682

668c1c

668c1c

contains 68

068 168 268 368 468 568 668 680 681 682 683 684 685 686 687 688 689 68a 68b 68c 68d 68e 68f 768 868 968 a68 b68 c68 d68 e68 f68

contains 82

082 182 282 382 482 582 682 782 820 821 822 823 824 825 826 827 828 829 82a 82b 82c 82d 82e 82f 882 982 a82 b82 c82 d82 e82 f82

contains 62

062 162 262 362 462 562 620 621 622 623 624 625 626 627 628 629 62a 62b 62c 62d 62e 62f 662 762 862 962 a62 b62 c62 d62 e62 f62