Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.
abc_dab_ _d_b_cdab_c_
Total 20 letters are in the series if we divide the series in 4 equal group and then we put the combination of letters of option B in the gap then we get the complete series.
abccd   abccd    abccd    abccd
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