Closest hex to #a3ff90 is #af8

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#
#af8

a3ff90

a3ff90

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 f8

0f8 1f8 2f8 3f8 4f8 5f8 6f8 7f8 8f8 9f8 af8 bf8 cf8 df8 ef8 f80 f81 f82 f83 f84 f85 f86 f87 f88 f89 f8a f8b f8c f8d f8e f8f ff8

contains a8

0a8 1a8 2a8 3a8 4a8 5a8 6a8 7a8 8a8 9a8 a80 a81 a82 a83 a84 a85 a86 a87 a88 a89 a8a a8b a8c a8d a8e a8f aa8 ba8 ca8 da8 ea8 fa8