Closest hex to #aaff33 is #af3

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#
#af3

aaff33

aaff33

contains af

0af 1af 2af 3af 4af 5af 6af 7af 8af 9af aaf af0 af1 af2 af3 af4 af5 af6 af7 af8 af9 afa afb afc afd afe aff baf caf daf eaf faf

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 a3

0a3 1a3 2a3 3a3 4a3 5a3 6a3 7a3 8a3 9a3 a30 a31 a32 a33 a34 a35 a36 a37 a38 a39 a3a a3b a3c a3d a3e a3f aa3 ba3 ca3 da3 ea3 fa3