Closest hex to #664c86 is #648

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#
#648

664c86

664c86

contains 64

064 164 264 364 464 564 640 641 642 643 644 645 646 647 648 649 64a 64b 64c 64d 64e 64f 664 764 864 964 a64 b64 c64 d64 e64 f64

contains 48

048 148 248 348 448 480 481 482 483 484 485 486 487 488 489 48a 48b 48c 48d 48e 48f 548 648 748 848 948 a48 b48 c48 d48 e48 f48

contains 68

068 168 268 368 468 568 668 680 681 682 683 684 685 686 687 688 689 68a 68b 68c 68d 68e 68f 768 868 968 a68 b68 c68 d68 e68 f68