Closest hex to #66d2b4 is #6cb

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#6cb

66d2b4

66d2b4

contains 6c

06c 16c 26c 36c 46c 56c 66c 6c0 6c1 6c2 6c3 6c4 6c5 6c6 6c7 6c8 6c9 6ca 6cb 6cc 6cd 6ce 6cf 76c 86c 96c a6c b6c c6c d6c e6c f6c

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 6b

06b 16b 26b 36b 46b 56b 66b 6b0 6b1 6b2 6b3 6b4 6b5 6b6 6b7 6b8 6b9 6ba 6bb 6bc 6bd 6be 6bf 76b 86b 96b a6b b6b c6b d6b e6b f6b