Closest hex to #1bbc04 is #2b0

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#
#2b0

1bbc04

1bbc04

contains 2b

02b 12b 22b 2b0 2b1 2b2 2b3 2b4 2b5 2b6 2b7 2b8 2b9 2ba 2bb 2bc 2bd 2be 2bf 32b 42b 52b 62b 72b 82b 92b a2b b2b c2b d2b e2b f2b

contains b0

0b0 1b0 2b0 3b0 4b0 5b0 6b0 7b0 8b0 9b0 ab0 b00 b01 b02 b03 b04 b05 b06 b07 b08 b09 b0a b0b b0c b0d b0e b0f bb0 cb0 db0 eb0 fb0

contains 20

020 120 200 201 202 203 204 205 206 207 208 209 20a 20b 20c 20d 20e 20f 220 320 420 520 620 720 820 920 a20 b20 c20 d20 e20 f20