Closest hex to #84ff31 is #8f3

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#
#8f3

84ff31

84ff31

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 f3

0f3 1f3 2f3 3f3 4f3 5f3 6f3 7f3 8f3 9f3 af3 bf3 cf3 df3 ef3 f30 f31 f32 f33 f34 f35 f36 f37 f38 f39 f3a f3b f3c f3d f3e f3f ff3

contains 83

083 183 283 383 483 583 683 783 830 831 832 833 834 835 836 837 838 839 83a 83b 83c 83d 83e 83f 883 983 a83 b83 c83 d83 e83 f83