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In the second round of the process, after adding the ground key, the value obtained is subjected to sub bytes. This involves looking at a four and substituting it with 49 according to the table. Similarly, other values such as 5b and ei are replaced accordingly. After sub bytes, the next step is to shift rows by circularly shifting each row. The first row remains unchanged, while the second row is shifted to the left and the third row is shifted by three. Finally, the process involves mixing columns by considering the values in each column.