Closest hex to #90fed1 is #8fc

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#
#8fc

90fed1

90fed1

contains 8f

08f 18f 28f 38f 48f 58f 68f 78f 88f 8f0 8f1 8f2 8f3 8f4 8f5 8f6 8f7 8f8 8f9 8fa 8fb 8fc 8fd 8fe 8ff 98f a8f b8f c8f d8f e8f f8f

contains fc

0fc 1fc 2fc 3fc 4fc 5fc 6fc 7fc 8fc 9fc afc bfc cfc dfc efc fc0 fc1 fc2 fc3 fc4 fc5 fc6 fc7 fc8 fc9 fca fcb fcc fcd fce fcf ffc

contains 8c

08c 18c 28c 38c 48c 58c 68c 78c 88c 8c0 8c1 8c2 8c3 8c4 8c5 8c6 8c7 8c8 8c9 8ca 8cb 8cc 8cd 8ce 8cf 98c a8c b8c c8c d8c e8c f8c