Closest hex to #31ca85 is #3c8

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#
#3c8

31ca85

31ca85

contains 3c

03c 13c 23c 33c 3c0 3c1 3c2 3c3 3c4 3c5 3c6 3c7 3c8 3c9 3ca 3cb 3cc 3cd 3ce 3cf 43c 53c 63c 73c 83c 93c a3c b3c c3c d3c e3c f3c

contains c8

0c8 1c8 2c8 3c8 4c8 5c8 6c8 7c8 8c8 9c8 ac8 bc8 c80 c81 c82 c83 c84 c85 c86 c87 c88 c89 c8a c8b c8c c8d c8e c8f cc8 dc8 ec8 fc8

contains 38

038 138 238 338 380 381 382 383 384 385 386 387 388 389 38a 38b 38c 38d 38e 38f 438 538 638 738 838 938 a38 b38 c38 d38 e38 f38