Closest hex to #183d1c is #142

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#
#142

183d1c

183d1c

contains 14

014 114 140 141 142 143 144 145 146 147 148 149 14a 14b 14c 14d 14e 14f 214 314 414 514 614 714 814 914 a14 b14 c14 d14 e14 f14

contains 42

042 142 242 342 420 421 422 423 424 425 426 427 428 429 42a 42b 42c 42d 42e 42f 442 542 642 742 842 942 a42 b42 c42 d42 e42 f42

contains 12

012 112 120 121 122 123 124 125 126 127 128 129 12a 12b 12c 12d 12e 12f 212 312 412 512 612 712 812 912 a12 b12 c12 d12 e12 f12