#### axis-group-interface

An object that groups other layout objects.

##### User settable properties:

`axes` (list)
  list of axis numbers. In the case of alignment grobs, this should contain only one number.

##### Internal properties:

`elements` (list of grobs)
  list of grobs, type depending on the Grob where this is set in.

This grob interface is used in the following graphical objects: BreakAlignGroup, BreakAlignment, DotColumn, DynamicLineSpanner, NonMusicalPaperColumn, NoteCollision, NoteColumn, PaperColumn, RemoveEmptyVerticalGroup, SostenutoPedalLineSpanner, SustainPedalLineSpanner, System, UnaCordaPedalLineSpanner, VerticalAlignment and VerticalAxisGroup

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