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Some of the letters are missing (blanks indicated by '_') in the letter series given below. Choose the correct order of letters from the options given below to fill in the blanks to complete the letter series.
a _ aba _ _ ba _ ab
Filling the blanks with b, b, a, b gives a<b>b</b>aba<b>ba</b>ba<b>b</b>ab, which is abababababab. This is the pair "ab" repeated six times. So the correct order is b b a b.
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