Closest hex to #77ff99 is #7f9

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#7f9

77ff99

77ff99

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 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 79

079 179 279 379 479 579 679 779 790 791 792 793 794 795 796 797 798 799 79a 79b 79c 79d 79e 79f 879 979 a79 b79 c79 d79 e79 f79