Closest hex to #81fb45 is #8f4

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#
#8f4

81fb45

81fb45

contains 8f

08f 18f 28f 38f 48f 58f 68f 78f 88f 8f0 8f1 8f2 8f3 8f4 8f5 8f6 8f7 8f8 8f9 8fa 8fb 8fc 8fd 8fe 8ff 98f a8f b8f c8f d8f e8f f8f

contains f4

0f4 1f4 2f4 3f4 4f4 5f4 6f4 7f4 8f4 9f4 af4 bf4 cf4 df4 ef4 f40 f41 f42 f43 f44 f45 f46 f47 f48 f49 f4a f4b f4c f4d f4e f4f ff4

contains 84

084 184 284 384 484 584 684 784 840 841 842 843 844 845 846 847 848 849 84a 84b 84c 84d 84e 84f 884 984 a84 b84 c84 d84 e84 f84