Closest hex to #ff9900 is #f90

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#f90

ff9900

ff9900

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 90

090 190 290 390 490 590 690 790 890 900 901 902 903 904 905 906 907 908 909 90a 90b 90c 90d 90e 90f 990 a90 b90 c90 d90 e90 f90

contains f0

0f0 1f0 2f0 3f0 4f0 5f0 6f0 7f0 8f0 9f0 af0 bf0 cf0 df0 ef0 f00 f01 f02 f03 f04 f05 f06 f07 f08 f09 f0a f0b f0c f0d f0e f0f ff0