Closest hex to #40c9e2 is #4cd

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#
#4cd

40c9e2

40c9e2

contains 4c

04c 14c 24c 34c 44c 4c0 4c1 4c2 4c3 4c4 4c5 4c6 4c7 4c8 4c9 4ca 4cb 4cc 4cd 4ce 4cf 54c 64c 74c 84c 94c a4c b4c c4c d4c e4c f4c

contains cd

0cd 1cd 2cd 3cd 4cd 5cd 6cd 7cd 8cd 9cd acd bcd ccd cd0 cd1 cd2 cd3 cd4 cd5 cd6 cd7 cd8 cd9 cda cdb cdc cdd cde cdf dcd ecd fcd

contains 4d

04d 14d 24d 34d 44d 4d0 4d1 4d2 4d3 4d4 4d5 4d6 4d7 4d8 4d9 4da 4db 4dc 4dd 4de 4df 54d 64d 74d 84d 94d a4d b4d c4d d4d e4d f4d