Closest hex to #30ce41 is #3c4

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#3c4

30ce41

30ce41

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 c4

0c4 1c4 2c4 3c4 4c4 5c4 6c4 7c4 8c4 9c4 ac4 bc4 c40 c41 c42 c43 c44 c45 c46 c47 c48 c49 c4a c4b c4c c4d c4e c4f cc4 dc4 ec4 fc4

contains 34

034 134 234 334 340 341 342 343 344 345 346 347 348 349 34a 34b 34c 34d 34e 34f 434 534 634 734 834 934 a34 b34 c34 d34 e34 f34