Question: What eastern European border was disputed between it's two nations after World War I, was re-established in 1990 as an identical version of its former self, changed only in the name of one of it's nations?
{'answer': 'Lithuania–Poland border', 'supporting_facts': [['Suwałki Region', 0], ['Suwałki Region', 1], ['Lithuania–Poland border', 0], ['Lithuania–Poland border', 1]]}