Closest hex to #6666bb is #66b

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#66b

6666bb

6666bb

contains 66

066 166 266 366 466 566 660 661 662 663 664 665 666 667 668 669 66a 66b 66c 66d 66e 66f 766 866 966 a66 b66 c66 d66 e66 f66

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

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