Closest hex to #66cc99 is #6c9

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#
#6c9

66cc99

66cc99

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 c9

0c9 1c9 2c9 3c9 4c9 5c9 6c9 7c9 8c9 9c9 ac9 bc9 c90 c91 c92 c93 c94 c95 c96 c97 c98 c99 c9a c9b c9c c9d c9e c9f cc9 dc9 ec9 fc9

contains 69

069 169 269 369 469 569 669 690 691 692 693 694 695 696 697 698 699 69a 69b 69c 69d 69e 69f 769 869 969 a69 b69 c69 d69 e69 f69