The series is abcbc/bcaca/cabab, Thus, the series consists of three sequences. The first sequence begins with a, the second with b, and the third with c. Each sequence consists of a letter followed by the pair of other two letters repeated twice.
The series is abcd/bcad/cabd/abcd/bcad/cabd. Clearly, each group consists of letters of the previous group in the order - second, third, first and fourth.
The series is abcd/aabbccdd/aaabbbcccddd. Thus, the each letter of first sequence is repeated two times in the second sequence and three times in the third sequence.
The series is acdb/dacb/cdab/acdb/da. Clearly, each group of four letters contains the letters of the previous group in the order - third, first, second and fourth.
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