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For elements it is possible to specify -elementtype <elementtype>to get only this kind of elements.
-higherentity <num>Allow to get only entities with this amount of higherentities.
- -canbedeleted <layer_name> returns a list with two items: a boolean 0|1 to know if layer or its child layers have some entity or parts in back layer or conditions over the layer. the second item is a message explaining the cause to not delete it directly.
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