Input: Read this: DNA replication is for the most part extremely accurate, however errors (mutations) do occur.:7.6 The error rate in eukaryotic cells can be as low as 108 per nucleotide per replication, whereas for some RNA viruses it can be as high as 103. This means that each generation, each human genome accumulates 12 new mutations. Small mutations can be caused by DNA replication and the aftermath of DNA damage and include point mutations in which a single base is altered and frameshift mutations in which a single base is inserted or deleted. Either of these mutations can change the gene by missense (change a codon to encode a different amino acid) or nonsense (a premature stop codon). Larger mutations can be caused by errors in recombination to cause chromosomal abnormalities including the duplication, deletion, rearrangement or inversion of large sections of a chromosome. Additionally, the DNA repair mechanisms that normally revert mutations can introduce errors when repairing the physical damage to the molecule is more important than restoring an exact copy, for example when repairing double-strand breaks.:5.4
Question: What is it called when errors occur in DNA replication?

Output: mutations

Input: Read this: The Navy was modernized in the 1880s, and by the 1890s had adopted the naval power strategy of Captain Alfred Thayer Mahanas indeed did every major navy. The old sailing ships were replaced by modern steel battleships, bringing them in line with the navies of Britain and Germany. In 1907, most of the Navy's battleships, with several support vessels, dubbed the Great White Fleet, were featured in a 14-month circumnavigation of the world. Ordered by President Theodore Roosevelt, it was a mission designed to demonstrate the Navy's capability to extend to the global theater.
Question: What replaced the younger sailing ships in the navy?

Output: unanswerable

Input: Read this: At the time of its release, Twilight Princess was considered the greatest entry in the Zelda series by many critics, including writers for 1UP.com, Computer and Video Games, Electronic Gaming Monthly, Game Informer, GamesRadar, IGN, and The Washington Post. It received several Game of the Year awards, and was the most critically acclaimed game of 2006. In 2011, the Wii version was rereleased under the Nintendo Selects label. A high-definition port for the Wii U, The Legend of Zelda: Twilight Princess HD, will be released in March 2016.
Question: How many Game of the Year awards did Radar Princess receive?

Output: unanswerable

Input: Read this: Agricultural protectionisma rare exception to Switzerland's free trade policieshas contributed to high food prices. Product market liberalisation is lagging behind many EU countries according to the OECD. Nevertheless, domestic purchasing power is one of the best in the world. Apart from agriculture, economic and trade barriers between the European Union and Switzerland are minimal and Switzerland has free trade agreements worldwide. Switzerland is a member of the European Free Trade Association (EFTA).
Question: What is Switzerland's world ranking in domestic purchasing power?

Output:
one of the best