Closest hex to #21fea0 is #2f9

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#2f9

21fea0

21fea0

contains 2f

02f 12f 22f 2f0 2f1 2f2 2f3 2f4 2f5 2f6 2f7 2f8 2f9 2fa 2fb 2fc 2fd 2fe 2ff 32f 42f 52f 62f 72f 82f 92f a2f b2f c2f d2f e2f f2f

contains f9

0f9 1f9 2f9 3f9 4f9 5f9 6f9 7f9 8f9 9f9 af9 bf9 cf9 df9 ef9 f90 f91 f92 f93 f94 f95 f96 f97 f98 f99 f9a f9b f9c f9d f9e f9f ff9

contains 29

029 129 229 290 291 292 293 294 295 296 297 298 299 29a 29b 29c 29d 29e 29f 329 429 529 629 729 829 929 a29 b29 c29 d29 e29 f29