How would you propose that this DNA is able to replicate itself?

How would you propose that this DNA is able to replicate itself?

you identified another organism that has also its DNA as triple helix, but specifically the structure is composed of a double helix with a third strand wound within the major groove. How would you propose that this DNA is able to replicate itself? In your answer, be specific about the base-pairing rules within the double helix and which part of the triplex DNA would be replicated first.