Closest hex to #12c18b is #1b8

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#1b8

12c18b

12c18b

contains 1b

01b 11b 1b0 1b1 1b2 1b3 1b4 1b5 1b6 1b7 1b8 1b9 1ba 1bb 1bc 1bd 1be 1bf 21b 31b 41b 51b 61b 71b 81b 91b a1b b1b c1b d1b e1b f1b

contains b8

0b8 1b8 2b8 3b8 4b8 5b8 6b8 7b8 8b8 9b8 ab8 b80 b81 b82 b83 b84 b85 b86 b87 b88 b89 b8a b8b b8c b8d b8e b8f bb8 cb8 db8 eb8 fb8

contains 18

018 118 180 181 182 183 184 185 186 187 188 189 18a 18b 18c 18d 18e 18f 218 318 418 518 618 718 818 918 a18 b18 c18 d18 e18 f18