Closest hex to #55ff99 is #5f9

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#5f9

55ff99

55ff99

contains 5f

05f 15f 25f 35f 45f 55f 5f0 5f1 5f2 5f3 5f4 5f5 5f6 5f7 5f8 5f9 5fa 5fb 5fc 5fd 5fe 5ff 65f 75f 85f 95f a5f b5f c5f d5f e5f f5f

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 59

059 159 259 359 459 559 590 591 592 593 594 595 596 597 598 599 59a 59b 59c 59d 59e 59f 659 759 859 959 a59 b59 c59 d59 e59 f59