Closest hex to #20374b is #234

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#
#234

20374b

20374b

contains 23

023 123 223 230 231 232 233 234 235 236 237 238 239 23a 23b 23c 23d 23e 23f 323 423 523 623 723 823 923 a23 b23 c23 d23 e23 f23

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

contains 24

024 124 224 240 241 242 243 244 245 246 247 248 249 24a 24b 24c 24d 24e 24f 324 424 524 624 724 824 924 a24 b24 c24 d24 e24 f24