Closest hex to #99bbff is #9bf

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#9bf

99bbff

99bbff

contains 9b

09b 19b 29b 39b 49b 59b 69b 79b 89b 99b 9b0 9b1 9b2 9b3 9b4 9b5 9b6 9b7 9b8 9b9 9ba 9bb 9bc 9bd 9be 9bf a9b b9b c9b d9b e9b f9b

contains bf

0bf 1bf 2bf 3bf 4bf 5bf 6bf 7bf 8bf 9bf abf bbf bf0 bf1 bf2 bf3 bf4 bf5 bf6 bf7 bf8 bf9 bfa bfb bfc bfd bfe bff cbf dbf ebf fbf

contains 9f

09f 19f 29f 39f 49f 59f 69f 79f 89f 99f 9f0 9f1 9f2 9f3 9f4 9f5 9f6 9f7 9f8 9f9 9fa 9fb 9fc 9fd 9fe 9ff a9f b9f c9f d9f e9f f9f