Input: Article: In 1469, following the Treaty of St. Omer, Upper Alsace was sold by Archduke Sigismund of Austria to Charles the Bold, Duke of Burgundy. Although Charles was the nominal landlord, taxes were paid to Frederick III, Holy Roman Emperor. The latter was able to use this tax and a dynastic marriage to his advantage to gain back full control of Upper Alsace (apart from the free towns, but including Belfort) in 1477 when it became part of the demesne of the Habsburg family, who were also rulers of the empire. The town of Mulhouse joined the Swiss Confederation in 1515, where it was to remain until 1798.

Now answer this question: Why did Frederick III use a tax and a marriage in Upper Alsace?

Output: to gain back full control of Upper Alsace

Input: Article: Upon exposure, the amount of light energy that reaches the film determines the effect upon the emulsion. If the brightness of the light is multiplied by a factor and the exposure of the film decreased by the same factor by varying the camera's shutter speed and aperture, so that the energy received is the same, the film will be developed to the same density. This rule is called reciprocity. The systems for determining the sensitivity for an emulsion are possible because reciprocity holds. In practice, reciprocity works reasonably well for normal photographic films for the range of exposures between 1/1000 second to 1/2 second. However, this relationship breaks down outside these limits, a phenomenon known as reciprocity failure.

Now answer this question: How is the exposure of film changed?

Output: by varying the camera's shutter speed and aperture

Input: Article: England is quite a successful nation at the UEFA European Football Championship, having finished in third place in 1968 and reached the semi-final in 1996. England hosted Euro 96 and have appeared in eight UEFA European Championship Finals tournaments, tied for ninth-best. The team has also reached the quarter-final on two recent occasions in 2004 and 2012. The team's worst result in the competition was a first-round elimination in 1980, 1988, 1992 and 2000. The team did not enter in 1960, and they failed to qualify in 1964, 1972, 1976, 1984, and 2008.

Now answer this question: In what four years was England eliminated from the UEFA European Championship in the first round?

Output:
1980, 1988, 1992 and 2000