Closest hex to #870c0c is #811

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#
#811

870c0c

870c0c

contains 81

081 181 281 381 481 581 681 781 810 811 812 813 814 815 816 817 818 819 81a 81b 81c 81d 81e 81f 881 981 a81 b81 c81 d81 e81 f81

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 81

081 181 281 381 481 581 681 781 810 811 812 813 814 815 816 817 818 819 81a 81b 81c 81d 81e 81f 881 981 a81 b81 c81 d81 e81 f81