Closest hex to #990d13 is #911

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#911

990d13

990d13

contains 91

091 191 291 391 491 591 691 791 891 910 911 912 913 914 915 916 917 918 919 91a 91b 91c 91d 91e 91f 991 a91 b91 c91 d91 e91 f91

contains 11

011 110 111 112 113 114 115 116 117 118 119 11a 11b 11c 11d 11e 11f 211 311 411 511 611 711 811 911 a11 b11 c11 d11 e11 f11

contains 91

091 191 291 391 491 591 691 791 891 910 911 912 913 914 915 916 917 918 919 91a 91b 91c 91d 91e 91f 991 a91 b91 c91 d91 e91 f91