Closest hex to #21b5bb is #2bb

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#2bb

21b5bb

21b5bb

contains 2b

02b 12b 22b 2b0 2b1 2b2 2b3 2b4 2b5 2b6 2b7 2b8 2b9 2ba 2bb 2bc 2bd 2be 2bf 32b 42b 52b 62b 72b 82b 92b a2b b2b c2b d2b e2b f2b

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 2b

02b 12b 22b 2b0 2b1 2b2 2b3 2b4 2b5 2b6 2b7 2b8 2b9 2ba 2bb 2bc 2bd 2be 2bf 32b 42b 52b 62b 72b 82b 92b a2b b2b c2b d2b e2b f2b