Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'We know that ethnic cleansing and genocide are being used in the Darfur region of the Sudan as a method of counter-insurgency , resulting in approximately 50,000 to 100,000 deaths .', Argument/Subject 1: 'darfur', Argument/Subject 2: 'sudan'
be region in