Input: Valencia
The city had surrendered without a fight to the invading Moors (Berbers and Arabs) by 714 AD, and the cathedral of Saint Vincent was turned into a mosque. Abd al-Rahman I, the first emir of Cordoba, ordered the city destroyed in 755 during his wars against other nobility, but several years later his son, Abdullah, had a form of autonomous rule over the province of Valencia. Among his administrative acts he ordered the building of a luxurious palace, the Russafa, on the outskirts of the city in the neighbourhood of the same name. So far no remains have been found. Also at this time Valencia received the name Medina al-Turab (City of Sand). When Islamic culture settled in, Valencia, then called Balansiyya, prospered from the 10th century, due to a booming trade in paper, silk, leather, ceramics, glass and silver-work. The architectural legacy of this period is abundant in Valencia and can still be appreciated today in the remnants of the old walls, the Baños del Almirante bath house, Portal de Valldigna street and even the Cathedral and the tower, El Micalet (El Miguelete), which was the minaret of the old mosque.

What was Valencia named during the time of Abdullah?
Output: Medina al-Turab

Input: Antenna (radio)
Recall that a current will reflect when there are changes in the electrical properties of the material. In order to efficiently send the signal into the transmission line, it is important that the transmission line has the same impedance as the elements, otherwise some of the signal will be reflected back into the antenna. This leads to the concept of impedance matching, the design of the overall system of antenna and transmission line so the impedance is as close as possible, thereby reducing these losses. Impedance matching between antennas and transmission lines is commonly handled through the use of a balun, although other solutions are also used in certain roles. An important measure of this basic concept is the standing wave ratio, which measures the magnitude of the reflected signal.

How is this process usually used for transmission lines and antennas?
Output: balun

Input: United States dollar
Technically, all these coins are still legal tender at face value, though some are far more valuable today for their numismatic value, and for gold and silver coins, their precious metal value. From 1965 to 1970 the Kennedy half dollar was the only circulating coin with any silver content, which was removed in 1971 and replaced with cupronickel. However, since 1992, the U.S. Mint has produced special Silver Proof Sets in addition to the regular yearly proof sets with silver dimes, quarters, and half dollars in place of the standard copper-nickel versions. In addition, an experimental $4.00 (Stella) coin was also minted in 1879, but never placed into circulation, and is properly considered to be a pattern rather than an actual coin denomination.

What was the Kennedy half dollar replaced with?
Output: cupronickel

Input: Arsenal F.C.
Arsenal have often been stereotyped as a defensive and "boring" side, especially during the 1970s and 1980s; many comedians, such as Eric Morecambe, made jokes about this at the team's expense. The theme was repeated in the 1997 film The Full Monty, in a scene where the lead actors move in a line and raise their hands, deliberately mimicking the Arsenal defence's offside trap, in an attempt to co-ordinate their striptease routine. Another film reference to the club's defence comes in the film Plunkett & Macleane, in which two characters are named Dixon and Winterburn after Arsenal's long-serving full backs – the right-sided Lee Dixon and the left-sided Nigel Winterburn.

In what decades were Arsenal players stereotyped in a negative way?
Output:
1970s and 1980s