Closest hex to #66dd33 is #6d3

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#6d3

66dd33

66dd33

contains 6d

06d 16d 26d 36d 46d 56d 66d 6d0 6d1 6d2 6d3 6d4 6d5 6d6 6d7 6d8 6d9 6da 6db 6dc 6dd 6de 6df 76d 86d 96d a6d b6d c6d d6d e6d f6d

contains d3

0d3 1d3 2d3 3d3 4d3 5d3 6d3 7d3 8d3 9d3 ad3 bd3 cd3 d30 d31 d32 d33 d34 d35 d36 d37 d38 d39 d3a d3b d3c d3d d3e d3f dd3 ed3 fd3

contains 63

063 163 263 363 463 563 630 631 632 633 634 635 636 637 638 639 63a 63b 63c 63d 63e 63f 663 763 863 963 a63 b63 c63 d63 e63 f63