Input: Article: Just as the navigational approach would require programs to loop in order to collect records, the relational approach would require loops to collect information about any one record. Codd's solution to the necessary looping was a set-oriented language, a suggestion that would later spawn the ubiquitous SQL. Using a branch of mathematics known as tuple calculus, he demonstrated that such a system could support all the operations of normal databases (inserting, updating etc.) as well as providing a simple system for finding and returning sets of data in a single operation.

Now answer this question: What type of math was used to create a system to find data sets?

Output: tuple calculus

Input: Article: General-in-Chief He Jin (d. 189 AD), half-brother to Empress He (d. 189 AD), plotted with Yuan Shao (d. 202 AD) to overthrow the eunuchs by having several generals march to the outskirts of the capital. There, in a written petition to Empress He, they demanded the eunuchs' execution. After a period of hesitation, Empress He consented. When the eunuchs discovered this, however, they had her brother He Miao () rescind the order. The eunuchs assassinated He Jin on September 22, 189 AD. Yuan Shao then besieged Luoyang's Northern Palace while his brother Yuan Shu (d. 199 AD) besieged the Southern Palace. On September 25 both palaces were breached and approximately two thousand eunuchs were killed. Zhang Rang had previously fled with Emperor Shao (r. 189 AD) and his brother Liu Xiethe future Emperor Xian of Han (r. 189220 AD). While being pursued by the Yuan brothers, Zhang committed suicide by jumping into the Yellow River.

Now answer this question: What did General-in-Chief He petition Empress He for?

Output: the eunuchs' execution

Input: Article: After the end of hostilities, a period of growth and expansion started for the city. In 1853 a stagecoach bus line was established joining Montevideo with the newly formed settlement of Union and the first natural gas street lights were inaugurated.[citation needed] From 1854 to 1861 the first public sanitation facilities were constructed. In 1856 the Teatro Solis was inaugurated, 15 years after the beginning of its construction. By Decree, on December 1861 the areas of Aguada and Cordon were incorporated to the growing Ciudad Nueva (New City). In 1866, an underwater telegraph line connected the city with Buenos Aires. The statue of Peace, La Paz, was erected on a column in Plaza Cagancha and the building of the Postal Service as well as the bridge of Paso Molino were inaugurated in 1867.

Now answer this question: What year was the Teatro Solis inaugurated?

Output:
1856