Closest hex to #99ff99 is #9f9

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#9f9

99ff99

99ff99

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 f9

0f9 1f9 2f9 3f9 4f9 5f9 6f9 7f9 8f9 9f9 af9 bf9 cf9 df9 ef9 f90 f91 f92 f93 f94 f95 f96 f97 f98 f99 f9a f9b f9c f9d f9e f9f ff9

contains 99

099 199 299 399 499 599 699 799 899 990 991 992 993 994 995 996 997 998 999 99a 99b 99c 99d 99e 99f a99 b99 c99 d99 e99 f99