Closest hex to #64c418 is #6c1

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#
#6c1

64c418

64c418

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 c1

0c1 1c1 2c1 3c1 4c1 5c1 6c1 7c1 8c1 9c1 ac1 bc1 c10 c11 c12 c13 c14 c15 c16 c17 c18 c19 c1a c1b c1c c1d c1e c1f cc1 dc1 ec1 fc1

contains 61

061 161 261 361 461 561 610 611 612 613 614 615 616 617 618 619 61a 61b 61c 61d 61e 61f 661 761 861 961 a61 b61 c61 d61 e61 f61