Closest hex to #18b3b8 is #1bb

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#1bb

18b3b8

18b3b8

contains 1b

01b 11b 1b0 1b1 1b2 1b3 1b4 1b5 1b6 1b7 1b8 1b9 1ba 1bb 1bc 1bd 1be 1bf 21b 31b 41b 51b 61b 71b 81b 91b a1b b1b c1b d1b e1b f1b

contains bb

0bb 1bb 2bb 3bb 4bb 5bb 6bb 7bb 8bb 9bb abb bb0 bb1 bb2 bb3 bb4 bb5 bb6 bb7 bb8 bb9 bba bbb bbc bbd bbe bbf cbb dbb ebb fbb

contains 1b

01b 11b 1b0 1b1 1b2 1b3 1b4 1b5 1b6 1b7 1b8 1b9 1ba 1bb 1bc 1bd 1be 1bf 21b 31b 41b 51b 61b 71b 81b 91b a1b b1b c1b d1b e1b f1b