Closest hex to #66ddbb is #6db

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#6db

66ddbb

66ddbb

contains 6d

06d 16d 26d 36d 46d 56d 66d 6d0 6d1 6d2 6d3 6d4 6d5 6d6 6d7 6d8 6d9 6da 6db 6dc 6dd 6de 6df 76d 86d 96d a6d b6d c6d d6d e6d f6d

contains db

0db 1db 2db 3db 4db 5db 6db 7db 8db 9db adb bdb cdb db0 db1 db2 db3 db4 db5 db6 db7 db8 db9 dba dbb dbc dbd dbe dbf ddb edb fdb

contains 6b

06b 16b 26b 36b 46b 56b 66b 6b0 6b1 6b2 6b3 6b4 6b5 6b6 6b7 6b8 6b9 6ba 6bb 6bc 6bd 6be 6bf 76b 86b 96b a6b b6b c6b d6b e6b f6b