Closest hex to #66cc22 is #6c2

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#
#6c2

66cc22

66cc22

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 c2

0c2 1c2 2c2 3c2 4c2 5c2 6c2 7c2 8c2 9c2 ac2 bc2 c20 c21 c22 c23 c24 c25 c26 c27 c28 c29 c2a c2b c2c c2d c2e c2f cc2 dc2 ec2 fc2

contains 62

062 162 262 362 462 562 620 621 622 623 624 625 626 627 628 629 62a 62b 62c 62d 62e 62f 662 762 862 962 a62 b62 c62 d62 e62 f62