If there were no slip lanes then the point where one vehicle has to give way to another is obvious. In this example the left turner has been taken out of the equation, right turners just have to give way to straight through traffic. Then, once they have completed their turn they come to the slip lane, or what is in fact a side road, on their left. Here they have priority. They are not turning and the markings indicate the through route. Therefore those vehicles that have turned left at the intersection have to give way to vehicles here, which could just of easily come straight through the intersection from the other direction. Merging is a bit of a red herring as this implies those with priority have to let them in, in this example they don't.
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