Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Data compression can be viewed as a special case of data differencing: Data differencing consists of producing a difference given a source and a target, with patching producing a target given a source and a difference, while data compression consists of producing a compressed file given a target, and decompression consists of producing a target given only a compressed file. Thus, one can consider data compression as data differencing with empty source data, the compressed file corresponding to a "difference from nothing." This is the same as considering absolute entropy (corresponding to data compression) as a special case of relative entropy (corresponding to data differencing) with no initial data.
What can be looked at as a special case of data differencing? 
A: Data compression

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In the Netherlands, the Supreme Court of the Netherlands is the highest. Its decisions, known as "arresten", are absolutely final. The court is banned from testing legislation against the constitution, pursuant to the principle of the sovereignty of the States-General; the court can, however, test legislation against some treaties. Also, the ordinary courts in the Netherlands, including the Hoge Raad, do not deal with administrative law, which is dealt with in separate administrative courts, the highest of which is the Council of State (Raad van State)
What is the term for the Council of States-General?
A: unanswerable

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Kathmandu is dissected by eight rivers, the main river of the valley, the Bagmati and its tributaries, of which the Bishnumati, Dhobi Khola, Manohara Khola, Hanumant Khola, and Tukucha Khola are predominant. The mountains from where these rivers originate are in the elevation range of 1,500–3,000 metres (4,900–9,800 ft), and have passes which provide access to and from Kathmandu and its valley. An ancient canal once flowed from Nagarjuna hill through Balaju to Kathmandu; this canal is now extinct.
How many rivers travel through Kathmandu?
A: eight

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Until the second half of the 15th century the empire had a Christian majority, under the rule of a Muslim minority. In the late 19th century, the non-Muslim population of the empire began to fall considerably, not only due to secession, but also because of migratory movements. The proportion of Muslims amounted to 60% in the 1820s, gradually increasing to 69% in the 1870s and then to 76% in the 1890s. By 1914, only 19.1% of the empire's population was non-Muslim, mostly made up of Christian Greeks, Assyrians, Armenians, and Jews.
What group began to decline within the Empire in the late 19th century?
A:
the non-Muslim population