Closest hex to #99ff33 is #9f3

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#9f3

99ff33

99ff33

contains 9f

09f 19f 29f 39f 49f 59f 69f 79f 89f 99f 9f0 9f1 9f2 9f3 9f4 9f5 9f6 9f7 9f8 9f9 9fa 9fb 9fc 9fd 9fe 9ff a9f b9f c9f d9f e9f f9f

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 93

093 193 293 393 493 593 693 793 893 930 931 932 933 934 935 936 937 938 939 93a 93b 93c 93d 93e 93f 993 a93 b93 c93 d93 e93 f93