#### system-interface

This is the toplevel object: each object in a score ultimately has a System object as its X and Y parent.

##### User settable properties:

`between-system-string` (string)
  string to dump between two systems. Useful for forcing page breaks.

##### Internal properties:

`all-elements` (list of grobs)
  list of all grobs in this line. Its function is to protect objects from being garbage collected.
`columns` (list of grobs)
  list of grobs, typically containing paper-columns or note-column objects.

This grob interface is used in the following graphical objects: System

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