However, if the primer is better for the complementary strand (“ATGC”), then the output will be “TACG”, which is the correct sequence.
So, if the sequence of interest reads “TACG” and the primer is best for that strand, the output will be “ATGC” and, therefore, must be converted back to “TACG”. However, if the primer is better for the complementary strand (“ATGC”), then the output will be “TACG”, which is the correct sequence.