Closest hex to #81fb50 is #8f5

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#
#8f5

81fb50

81fb50

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 f5

0f5 1f5 2f5 3f5 4f5 5f5 6f5 7f5 8f5 9f5 af5 bf5 cf5 df5 ef5 f50 f51 f52 f53 f54 f55 f56 f57 f58 f59 f5a f5b f5c f5d f5e f5f ff5

contains 85

085 185 285 385 485 585 685 785 850 851 852 853 854 855 856 857 858 859 85a 85b 85c 85d 85e 85f 885 985 a85 b85 c85 d85 e85 f85