Closest hex to #731d34 is #723

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#723

731d34

731d34

contains 72

072 172 272 372 472 572 672 720 721 722 723 724 725 726 727 728 729 72a 72b 72c 72d 72e 72f 772 872 972 a72 b72 c72 d72 e72 f72

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 73

073 173 273 373 473 573 673 730 731 732 733 734 735 736 737 738 739 73a 73b 73c 73d 73e 73f 773 873 973 a73 b73 c73 d73 e73 f73