Closest hex to #a8fd21 is #af2

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#
#af2

a8fd21

a8fd21

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 f2

0f2 1f2 2f2 3f2 4f2 5f2 6f2 7f2 8f2 9f2 af2 bf2 cf2 df2 ef2 f20 f21 f22 f23 f24 f25 f26 f27 f28 f29 f2a f2b f2c f2d f2e f2f ff2

contains a2

0a2 1a2 2a2 3a2 4a2 5a2 6a2 7a2 8a2 9a2 a20 a21 a22 a23 a24 a25 a26 a27 a28 a29 a2a a2b a2c a2d a2e a2f aa2 ba2 ca2 da2 ea2 fa2