Beam corners can occur when a change of stem direction within a beam is combined with a break in the secondary beam group. This can be at the end of a subdivision or at a change in rhythmic speed.
Beam corners do not follow accepted rules regarding the order and rhythmic meaning of secondary beams, and can be confusing for the reader.
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Dorico Pro avoids beam corners by analyzing the pitches and stems within a phrase, and implementing stem directions that avoid a beam corner.