Closest hex to #abbfaa is #aba

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#
#aba

abbfaa

abbfaa

contains ab

0ab 1ab 2ab 3ab 4ab 5ab 6ab 7ab 8ab 9ab aab ab0 ab1 ab2 ab3 ab4 ab5 ab6 ab7 ab8 ab9 aba abb abc abd abe abf bab cab dab eab fab

contains ba

0ba 1ba 2ba 3ba 4ba 5ba 6ba 7ba 8ba 9ba aba ba0 ba1 ba2 ba3 ba4 ba5 ba6 ba7 ba8 ba9 baa bab bac bad bae baf bba cba dba eba fba

contains aa

0aa 1aa 2aa 3aa 4aa 5aa 6aa 7aa 8aa 9aa aa0 aa1 aa2 aa3 aa4 aa5 aa6 aa7 aa8 aa9 aaa aab aac aad aae aaf baa caa daa eaa faa