Closest hex to #001903 is #010

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#
#010

001903

001903

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 10

010 100 101 102 103 104 105 106 107 108 109 10a 10b 10c 10d 10e 10f 110 210 310 410 510 610 710 810 910 a10 b10 c10 d10 e10 f10

contains 00

000 001 002 003 004 005 006 007 008 009 00a 00b 00c 00d 00e 00f 100 200 300 400 500 600 700 800 900 a00 b00 c00 d00 e00 f00