Closest hex to #18ff89 is #1f8

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#1f8

18ff89

18ff89

contains 1f

01f 11f 1f0 1f1 1f2 1f3 1f4 1f5 1f6 1f7 1f8 1f9 1fa 1fb 1fc 1fd 1fe 1ff 21f 31f 41f 51f 61f 71f 81f 91f a1f b1f c1f d1f e1f f1f

contains f8

0f8 1f8 2f8 3f8 4f8 5f8 6f8 7f8 8f8 9f8 af8 bf8 cf8 df8 ef8 f80 f81 f82 f83 f84 f85 f86 f87 f88 f89 f8a f8b f8c f8d f8e f8f ff8

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