Closest hex to #66f9d4 is #6fc

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#6fc

66f9d4

66f9d4

contains 6f

06f 16f 26f 36f 46f 56f 66f 6f0 6f1 6f2 6f3 6f4 6f5 6f6 6f7 6f8 6f9 6fa 6fb 6fc 6fd 6fe 6ff 76f 86f 96f a6f b6f c6f d6f e6f f6f

contains fc

0fc 1fc 2fc 3fc 4fc 5fc 6fc 7fc 8fc 9fc afc bfc cfc dfc efc fc0 fc1 fc2 fc3 fc4 fc5 fc6 fc7 fc8 fc9 fca fcb fcc fcd fce fcf ffc

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