The computer will convert the letters, so the final sequence is the correct TACG.
In short, before starting, you need to know what you’re targeting and how you’re going to get there! So keeping this in mind, here is an example of the former example (TACG -> ATGC -> TACG). If the dideoxynucleotides labels are T = yellow, A = pink, C = dark blue, and G = light blue, you will end up with the short sequences primer-A, primer-AT, primer-ATG, and primer-ATGC. Once the fragments have been separated by electrophoresis, the laser will read the fragments in order of length (pink, yellow, light blue, and dark blue) and produce a chromatogram. The computer will convert the letters, so the final sequence is the correct TACG.