Closest hex to #af0315 is #a01

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#
#a01

af0315

af0315

contains a0

0a0 1a0 2a0 3a0 4a0 5a0 6a0 7a0 8a0 9a0 a00 a01 a02 a03 a04 a05 a06 a07 a08 a09 a0a a0b a0c a0d a0e a0f aa0 ba0 ca0 da0 ea0 fa0

contains 01

001 010 011 012 013 014 015 016 017 018 019 01a 01b 01c 01d 01e 01f 101 201 301 401 501 601 701 801 901 a01 b01 c01 d01 e01 f01

contains a1

0a1 1a1 2a1 3a1 4a1 5a1 6a1 7a1 8a1 9a1 a10 a11 a12 a13 a14 a15 a16 a17 a18 a19 a1a a1b a1c a1d a1e a1f aa1 ba1 ca1 da1 ea1 fa1