Closest hex to #66ccff is #6cf

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#
#6cf

66ccff

66ccff

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 cf

0cf 1cf 2cf 3cf 4cf 5cf 6cf 7cf 8cf 9cf acf bcf ccf cf0 cf1 cf2 cf3 cf4 cf5 cf6 cf7 cf8 cf9 cfa cfb cfc cfd cfe cff dcf ecf fcf

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