Closest hex to #aacccc is #acc

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#
#acc

aacccc

aacccc

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 cc

0cc 1cc 2cc 3cc 4cc 5cc 6cc 7cc 8cc 9cc acc bcc cc0 cc1 cc2 cc3 cc4 cc5 cc6 cc7 cc8 cc9 cca ccb ccc ccd cce ccf dcc ecc fcc

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