Problem: Please answer a question about the following article about Frédéric Chopin:
Chopin's music is frequently played with rubato, "the practice in performance of disregarding strict time, 'robbing' some note-values for expressive effect". There are differing opinions as to how much, and what type, of rubato is appropriate for his works. Charles Rosen comments that "most of the written-out indications of rubato in Chopin are to be found in his mazurkas ... It is probable that Chopin used the older form of rubato so important to Mozart ... [where] the melody note in the right hand is delayed until after the note in the bass ... An allied form of this rubato is the arpeggiation of the chords thereby delaying the melody note; according to Chopin's pupil, Karol Mikuli, Chopin was firmly opposed to this practice."
Chopin's compositions are often played with what?
A: rubato


Question: Read this and answer the question

Portugal (Portuguese: [puɾtuˈɣaɫ]), officially the Portuguese Republic (Portuguese: República Portuguesa), is a country on the Iberian Peninsula, in Southwestern Europe. It is the westernmost country of mainland Europe, being bordered by the Atlantic Ocean to the west and south and by Spain to the north and east. The Portugal–Spain border is 1,214 km (754 mi) long and considered the longest uninterrupted border within the European Union. The republic also includes the Atlantic archipelagos of the Azores and Madeira, both autonomous regions with their own regional governments.

How long is the Portugal-Spain border?
Answer: 1,214 km (754 mi)


Problem: Hunting is the practice of killing or trapping any animal, or pursuing or tracking it with the intent of doing so. Hunting wildlife or feral animals is most commonly done by humans for food, recreation, to remove predators which are dangerous to humans or domestic animals, or for trade. In the 2010s, lawful hunting is distinguished from poaching, which is the illegal killing, trapping or capture of the hunted species. The species that are hunted are referred to as game or prey and are usually mammals and birds.
What species are usually hunted?
The answer is the following: mammals and birds


Southampton is home to Southampton Football Club—nicknamed "The Saints"—who play in the Premier League at St Mary's Stadium, having relocated in 2001 from their 103-year-old former stadium, "The Dell". They reached the top flight of English football (First Division) for the first time in 1966, staying there for eight years. They lifted the FA Cup with a shock victory over Manchester United in 1976, returned to the top flight two years later, and stayed there for 27 years (becoming founder members of the Premier League in 1992) before they were relegated in 2005. The club was promoted back to the Premier League in 2012 following a brief spell in the third-tier and severe financial difficulties. In 2015, "The Saints" finished 7th in the Premier League, their highest league finish in 30 years, after a remarkable season under new manager Ronald Koeman. Their highest league position came in 1984 when they were runners-up in the old First Division. They were also runners-up in the 1979 Football League Cup final and 2003 FA Cup final. Notable former managers include Ted Bates, Lawrie McMenemy, Chris Nicholl, Ian Branfoot and Gordon Strachan. There is a strong rivalry between Portsmouth F.C. ("South Coast derby") which is located only about 30 km (19 mi) away.
What league did Southampton Football Club become founding members of in 1992? 
the Premier League


Input: On the Origin of Species
Chapter VII (of the first edition) addresses the evolution of instincts. His examples included two he had investigated experimentally: slave-making ants and the construction of hexagonal cells by honey bees. Darwin noted that some species of slave-making ants were more dependent on slaves than others, and he observed that many ant species will collect and store the pupae of other species as food. He thought it reasonable that species with an extreme dependency on slave workers had evolved in incremental steps. He suggested that bees that make hexagonal cells evolved in steps from bees that made round cells, under pressure from natural selection to economise wax. Darwin concluded:

What did Darwin notice specifically about slave-making ants?
Output: some species of slave-making ants were more dependent on slaves than others


Problem: Please answer a question about the following article about Antenna (radio):
Maximum power transfer requires matching the impedance of an antenna system (as seen looking into the transmission line) to the complex conjugate of the impedance of the receiver or transmitter. In the case of a transmitter, however, the desired matching impedance might not correspond to the dynamic output impedance of the transmitter as analyzed as a source impedance but rather the design value (typically 50 ohms) required for efficient and safe operation of the transmitting circuitry. The intended impedance is normally resistive but a transmitter (and some receivers) may have additional adjustments to cancel a certain amount of reactance in order to "tweak" the match. When a transmission line is used in between the antenna and the transmitter (or receiver) one generally would like an antenna system whose impedance is resistive and near the characteristic impedance of that transmission line in order to minimize the standing wave ratio (SWR) and the increase in transmission line losses it entails, in addition to supplying a good match at the transmitter or receiver itself.
What requires matching of the empedance to an antenna system?
A:
Maximum power transfer