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The seemingly contradictory influences of r on neighboring sounds in the early Germanic languages have fueled controversy over r's articulation in Proto-Germanic and later dialects. In this paper, we examine a number of these early Germanic sound changes and compare their effects to those observed in recent phonetic studies of the coarticulation of different types of r on adjacent vowels. We conclude that an apical trill and a central approximant r are phonetically the most likely conditioners of the earliest Germanic sound changes, while later changes can be accounted for by rhotics which were phonetically related to these earlier articulations
