Closest hex to #30cdc0 is #3cb

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#3cb

30cdc0

30cdc0

contains 3c

03c 13c 23c 33c 3c0 3c1 3c2 3c3 3c4 3c5 3c6 3c7 3c8 3c9 3ca 3cb 3cc 3cd 3ce 3cf 43c 53c 63c 73c 83c 93c a3c b3c c3c d3c e3c f3c

contains cb

0cb 1cb 2cb 3cb 4cb 5cb 6cb 7cb 8cb 9cb acb bcb cb0 cb1 cb2 cb3 cb4 cb5 cb6 cb7 cb8 cb9 cba cbb cbc cbd cbe cbf ccb dcb ecb fcb

contains 3b

03b 13b 23b 33b 3b0 3b1 3b2 3b3 3b4 3b5 3b6 3b7 3b8 3b9 3ba 3bb 3bc 3bd 3be 3bf 43b 53b 63b 73b 83b 93b a3b b3b c3b d3b e3b f3b