In this task, you are given news articles and you need to generate a highlight, i.e., a short summary, with a maximum length of 10 lines.

Example Input: (CNN) -- One of the three guns Adam Lanza used to kill 20 children and six adults at an elementary school in Newtown, Connecticut, was a military-style semiautomatic rifle known as an AR-15. That surprised and shocked a lot of people unfamiliar with America's gun culture. They questioned why such weapons are available and why anyone would need them. "Personally I don't know how any ordinary citizen can justify owning an automatic or semiautomatic gun," writes CNN commenter Mark Smerkanich. "Can't we leave those guns to the trained military?" Self-described gun owner Julie Jones-Hawkins comments, "I ... fully support a ban on rapid-fire weapons. Any weapon that can take out an entire kindergarten class is a problem." Here are five reasons many gun owners say they want military style rifles: . 'Some people play golf, others bowl. I shoot' "Every month or so I take my guns out to the range and shoot. It's thrilling, exciting and a great way to vent," says Christopher L. Kirkman, a Florida-based military-style gun owner. Kirman was one of more than 100 gun enthusiasts who shared opinions on CNN iReport about owning firearms that would have been banned under the now-expired 1994 federal weapons ban. "Sure, I could try to say that the reason I own these guns is self-defense, but the truth of the matter is that, although they will technically serve this purpose, they are not why I own them," he says. Michigan gun owner Ethan Daniels describes his enthusiasm for his rifle more succinctly, saying, "I like to shoot, and that is one heck of a fun carbine to plink with." iReport: Tell us why you own your military-style weapon . Background can factor into a gun owner's choice of weapon. "The AR-15 is what I am used to from my extensive training as an airborne infantryman," writes Nathan Lee. "Because of my training, it's what I feel the most comfortable with." Another reason for these guns is hunting. The AR-15 is a "good hunting platform. I've hunted coyote with it," says CNN iReporter MVR155, who owns two of the weapons. He asked to remain anonymous. Owners of military-style rifles also use them to hunt deer and other game. But some states have banned the AR-15 and its .223 caliber for deer hunting. Related: Newtown shooter's guns: What we know . 'It's cool' It may not be the best or most important reason, but military-style weapons often appeal to the enthusiast side of the American gun owner. Just like many car lovers who dream of owning a Lamborghini, many gun owners get excited about the idea of owning an AR-15. "There are people who buy certain types of firearms because they have a certain image -- the AR-15 is one of them," says Austin Nikel, a former AR-15 owner in Boulder, Colorado. "One thing about this country is how Hollywood has glorified the image behind those certain types of weapons. A lot of guys grow up with GI Joe, and that image is extremely attractive. It grabs you and affects you. "A lot of people buy the AR-15 because, well, it's cool." Apparently it wasn't cool enough for Nikel to hold on to. He ended up selling his AR-15 to his father. iReport: Why some own military-style weapons . 'A part of history' "Since coming of age -- and in the decades since -- I have collected many different firearms, some of them historical pieces, some for sport, some of them even the so-called 'assault weapons' that are now a controversy," says iReporter Hrothgar01. "Guns like these are as much a part of the history of this country as the muskets carried by pioneers, the rifles toted by doughboys in the trenches, and the other arms that have served and protected throughout the years. To hold one in your hands, appreciate its history and design, and to be able to take that piece of history to the range and work -- it is a feeling that many people in this debate do not understand or appreciate." Related story: By the numbers: Guns in America . 'Protecting my family' "I believe the foremost person responsible for protecting my family and myself is me," writes iReporter ShortyDoowap, who owns a pair of AR-15s. "These rifles provide me with the tools to perform that duty. I don't own these guns to target shoot, though I do that with them. I don't hunt with them, though I could in a pinch." Parks says he "would not hesitate to use one to simply defend my home and family from a single intruder if it became necessary." Related: Parents defend right to keep guns in the home . In some home-protection situations, fans say military-style rifles are generally more accurate than handguns. Rifles are generally easier to learn how to shoot, say military-style rifle owners. Like most firearms, military-style weapons such as the AR-15 are semiautomatic -- increasing protection because the shooter can fire off many shots without having to manually chamber a new bullet. With a bolt-action rifle or pump-action shotgun, firing multiple shots takes more time. "When you weigh it all out, these types of guns are stigmatized," says iReporter MVR155. Military-style weapons look more dangerous than other guns, he says, but really, there are many weapons available which are just as lethal, but which are not designed in a military style. iReport: One gun owner's solution . 'Fascination with the Second Amendment' "I am a proud owner of an AK-47," writes iReporter INGunOwner. "It's a terrific gun. Lots of fun to shoot. I own an AK because of my fascination with the Second Amendment, which I view as a backstop protector of freedom. Many people would argue that we have no use for it today because the government is trustworthy. "However since it acts as a deterrent, we can never measure exactly how much it has been effective. Perhaps the notion that people feel safe with our government after over 200 years is a testament to the Second Amendment value in balancing power with the citizens." Related: Gun owners fear new legislation could tread on their rights . CNN's Henry Hanks contributed to this report.
Example Output: A military-style rifle was used in the Newtown, Connecticut, school shooting .
"Can't we leave those guns to the trained military?" asks a CNN commenter .
Many gun owners collect them, using them for hunting, target shooting and protection .
"A lot of people buy the AR-15 because, well, it's cool," says a former owner .

Example Input: (CNN) -- Ollanta Humala, a left-leaning Peruvian politician who promises reforms in education and services to the poor, was sworn in as the nation's president Thursday. In his first address as president, Humala stressed equality, saying he wants Peru to be "a place where everyone enjoys the same rights to abundance and happiness." "Economic growth and social inclusion must march together," he said of his governing philosophy. He succeeds Alan Garcia, who oversaw a period of robust economic growth as president, but who nonetheless was unpopular and criticized for promoting business at the expense of indigenous groups and the environment. Humala, an ex-army officer who ran unsuccessfully for president in 2006 as a leftist ally of Venezuela's Hugo Chavez, reinvented himself as a more moderate leader. He calmed markets and worries that his moderation was a facade to win the election by naming a Cabinet made up of political moderates. The new president has promised to spread the benefits of Peru's economic boom to the poor. He has cited needs to improve the nation's infrastructure, water, sanitation and education, particularly in rural areas. A number of presidents from other Latin American countries, including Ecuador, Chile and Brazil, were on hand to witness the swearing-in ceremony. There was a small oddity during the swearing in of Humala and his two vice presidents, when they all swore allegiance to Peru's 1979 Constitution. That document, however, was replaced in 1993 by a new one drafted during the presidency of strongman Alberto Fujimori. Humala defeated Fujimori's daughter, Keiko, to win the presidency. The slap at the current Constitution resulted in boos and shouts from members of Fujimori's party. Several times in his speech, Humala talked about the importance of unity. "Reality requires a new social contract that makes it possible for all Peruvians to live together," he said. He added that he wants "to be seen as a defender of human rights and of freedom of the press and expression." Other leftist leaders in Latin America, such as Ecuadorian President Rafael Correa and Venezuela's Chavez, have been criticized by press freedom organizations for clamping down on the media. Humala promised change, but warned that it would not be as swift as his critics fear, or as some of his supporters desire. To be lasting, he said, "any changes must be gradual and rational." In another minor controversy, the outgoing president, Garcia, did not attend the swearing-in ceremony to pass the presidential sash to his successor. Garcia, who was also president in a disastrous term from 1985 to 1990, was booed and heckled by Congress when he bid farewell. According to local media, he decided not to attend this time to avoid another round of heckling.
Example Output: NEW:  Peru's new president stresses equality .
Humala is a former army officer .
He is a leftist who has moderated his stance .
He promises to spread the benefits of Peru's economic boom to the poor .

Example Input: (CNN) -- Earlier this month, an AeroMexico plane made an important flight from Mexico City to Madrid. The flight wasn't notable for who was inside the cabin, but for what was inside the fuel tank: it was the world's first transatlantic commercial flight using biofuel. The engines on that flight were powered by a fuel mixture that was 30% biofuel from the jatropha plant, and the trip followed a pair of Mexican domestic commercial flights by Interjet that used the same formula. Mexico is known for its oil production, but it could be its less obvious flats of arid and marginal land that will be the future of Mexico's energy resources. The country has quietly positioned itself to become a potential leader in biofuel production as scientists develop a second generation of fuels derived from sources that don't compete for arable land or with food. Jatropha-based biofuels are being increasingly used in Mexico, and agave -- the plant from which tequila is made -- is being studied as a new source for ethanol. But some observers warn that Mexico's cumbersome land laws make it too hard to purchase the land needed for cultivation at competitive prices. Some biofuels, such as ethanol derived from corn and sugar, can indirectly raise the prices of staple foods in many places, along with raising ethical issues, said Gilberto Lopez Meyer, director of Airports and Auxiliary Services (ASA), the Mexican government agency that oversaw the biofuel flights. So in 2007, Mexico, along with 14 other member countries of the International Civil Aviation Organization, committed to developing new strategies for second-generation biofuels that would not affect food production. "We returned to Mexico with a mission," Lopez told CNN. Lopez's agency teamed up with the state of Chiapas, where Gov. Juan Sabines had already made a name for himself pushing his state toward alternative fuels. Chiapas began cultivating jatropha, whose seeds contain oil that can be extracted and converted into biofuel. The state already uses a jatropha biofuel mix on its buses and trucks, and President Felipe Calderon was on hand in November of last year to inaugurate a biodiesal plant there. ASA partnered with American company UOP, which refined the Chiapas jatropha into jet fuel. When the standards for biofuel use in commercial flights was approved July 1, Mexico was ready to make the domestic Interjet and international AeroMexico flights a possibility. The goal of ASA, which provides almost 100% of the jet fuel in Mexico, is to commercialize and distribute biofuels, Lopez said. "We've been working on this project as part of a global effort to combat climate change," he said. By 2015, the goal is to have 1% of all jet fuel in Mexico be biofuel, and by 2020, 15%, he said. "This is a huge goal," Lopez said. "One percent doesn't sound like a lot, but it equals more than 40 million liters (10.6 million gallons)." Mexico has several things in its favor to become a leader in biofuels, he said. It has plenty of land not being used for food, it has a high demand for energy, and it is located next door to the energy-hungry United States. "Mexico has made the very important first step to be in a very priviledged place," Lopez said. Halfway across the world, researchers at Oxford recently published a study extolling the benefits that ethanol derived from agave. Agave can grow in arid land, and produces less than half of the carbon dioxide emissions produced by corn-based ethanol, Oliver Inderwildi, one of the study's authors, told CNN. Sugar-based ethanol produces even less emissions, but it needs arable land for cultivation. "We need every space we can get, every arable land, for food," Inderwildi said. "We think agave may be one part of the solution." For their study, the researchers did a life-cycle analysis for the production of ethanol based on a hypothetical plant in Jalisco, Mexico, where 90% of tequila is produced. Potentially, agave plantations could boost local economies and create jobs, Inderwildi said. Mexico, the native home of agave plants, stands to benefit if such an ethanol industry takes off. Food prices would be spared, but would drinkers have to pay more for their margaritas and tequila shots? The tequila business is very small compared to the fuel business, and is also more expensive than fuel ethanol, so Inderwildi predicts that alcohol prices would remain stable. And unlike tequila, which requires the harvesting of the agave stem only, ethanol production would also require harvesting the leaves of the plant. "Our study backs up that this is a good idea from an environmental perspective," he said. The catch, for now, is that neither jatropha or agave biofuel production is cost-effective. But technological advances and oil prices make such alternatives more desirable. When that tipping point comes, Mexico will be ready, the experts said. But James Row, CEO of Houston-based Producers Energy and part owner of a Mexican-based biodiesel company, told CNN that Mexico is still far from being an ideal place to produce biofuels. "Mexico is absolutely a perfect country for biodiesel, especially if it can be domestically grown," he said, but the country's ejido system -- collectively-held land in rural areas -- creates hurdles for private investment. The result is difficulty in finding continuous large areas of rural land that can be negotiated for use for cultivation, or high prices that make it cost prohibitive. Without land reform, issues with land availability will continue, and Mexico will fall a decade or more behind other countries in the biofuels sector, Row said. The demand is there, the land is there, but there is no way to get it, he said. "Now is the time for Mexico to get its act together for biofuels," he said.
Example Output:
Mexico has quietly positioned itself as a potential biofuels leader .
It oversaw the first transatlantic commercial flight using biofuel .
The agave plant also has potential for the country .
Without land reform, private investment in sector is tough .