Closest hex to #81bc19 is #8b1

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#
#8b1

81bc19

81bc19

contains 8b

08b 18b 28b 38b 48b 58b 68b 78b 88b 8b0 8b1 8b2 8b3 8b4 8b5 8b6 8b7 8b8 8b9 8ba 8bb 8bc 8bd 8be 8bf 98b a8b b8b c8b d8b e8b f8b

contains b1

0b1 1b1 2b1 3b1 4b1 5b1 6b1 7b1 8b1 9b1 ab1 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b1a b1b b1c b1d b1e b1f bb1 cb1 db1 eb1 fb1

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