How can I obtain the information about which language dictionaries are made available in an iPad?

I am using UIReferenceLibraryViewController to obtain entries of language dictionaries of iPads through my app. I would also like to check which dictionaries were used to display its entry. How can I programmatically obtain which dictionaries are made available in an iPad using Swift?

Please and Thank you!

How can I obtain the information about which language dictionaries are made available in an iPad?
 
 
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