Pre Scriptum: Sorry for my english language.

N.B. Abstract article.

I think, may the "minus" clause be useful for "union" and "merge" ?
Often need make hole, and then allocate in this hole some object. For
example:
wall_object, window_hole_object, and window_frame_object (with glasses and
curtains :) ).

Normal way, to make it:

union{
  // making wall with hole
  difference{
    wall_object
    window_hole_object
  }
  // making holled wall with window
  window_frame_object
}

Using "minus" clause:

union{
  wall_object
  // making wall with hole
  MINUS window_hole_object
  // making holled wall with window
  window_frame_object
}

Difference between both cases not very match, but (I think), second case is
more readable.

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