Closest hex to #77ff33 is #7f3

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#7f3

77ff33

77ff33

contains 7f

07f 17f 27f 37f 47f 57f 67f 77f 7f0 7f1 7f2 7f3 7f4 7f5 7f6 7f7 7f8 7f9 7fa 7fb 7fc 7fd 7fe 7ff 87f 97f a7f b7f c7f d7f e7f f7f

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 73

073 173 273 373 473 573 673 730 731 732 733 734 735 736 737 738 739 73a 73b 73c 73d 73e 73f 773 873 973 a73 b73 c73 d73 e73 f73