Closest hex to #66aacc is #6ac

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#
#6ac

66aacc

66aacc

contains 6a

06a 16a 26a 36a 46a 56a 66a 6a0 6a1 6a2 6a3 6a4 6a5 6a6 6a7 6a8 6a9 6aa 6ab 6ac 6ad 6ae 6af 76a 86a 96a a6a b6a c6a d6a e6a f6a

contains ac

0ac 1ac 2ac 3ac 4ac 5ac 6ac 7ac 8ac 9ac aac ac0 ac1 ac2 ac3 ac4 ac5 ac6 ac7 ac8 ac9 aca acb acc acd ace acf bac cac dac eac fac

contains 6c

06c 16c 26c 36c 46c 56c 66c 6c0 6c1 6c2 6c3 6c4 6c5 6c6 6c7 6c8 6c9 6ca 6cb 6cc 6cd 6ce 6cf 76c 86c 96c a6c b6c c6c d6c e6c f6c