Closest hex to #881f31 is #823

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#
#823

881f31

881f31

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 23

023 123 223 230 231 232 233 234 235 236 237 238 239 23a 23b 23c 23d 23e 23f 323 423 523 623 723 823 923 a23 b23 c23 d23 e23 f23

contains 83

083 183 283 383 483 583 683 783 830 831 832 833 834 835 836 837 838 839 83a 83b 83c 83d 83e 83f 883 983 a83 b83 c83 d83 e83 f83