Select the combination of letters that when sequentially placed from left to right in the blanks of the given letter series will complete the series. a_ _cc_aabc_d_ _bcc_a_ _ccd

adbcaadab badcadaab abdcaadab badcaadab

abdcaadab

The given pattern is : aabccd aabccd / aabccd / aabccd / aabccd Code to be used is: abdcaadab