Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: A man who could be one of Brazil's most prolific serial killers has confessed to murdering more than 40 people. 
  
 Sailson Jose das Gracas told reporters at a police station he killed for pleasure and an adrenaline rush. 
  
 He said he murdered for the "fun of it", according to officers. 
  
 Das Gracas, who has been described as a psychopath by police, said he preferred to kill white women, whom he allegedly strangled. 
  
 And the 26-year-old suspect said he would often watch his victims for months before making his move. 
  
 He also said he operated as a killer for hire, where he would use a gun rather than strangle his victims 
  
 Police arrested him shortly after he allegedly stabbed a woman to death in the Rio de Janeiro suburb of Nova Iguacu. 
  
 Sailson Jose das Gracas appears in handcuffs before the cameras 
  
 He claimed he planned his crimes meticulously, wearing a rain jacket in order to conceal his identity and gloves so he would not leave fingerprints, adding he became addicted to murder. 
  
 Police allowed him to speak to reporters which is not uncommon in Brazil. 
  
 Das Gracas said he killed 37 women, three men and a two-year-old over a nine-year spree, explaining he took the child's life because he feared the youngster would cry and attract neighbours' attention. 
  
 "I observed them, I studied them. I waited for a month, sometimes a week, depending on the place. I tried to ascertain where they lived, what their families were like", he was quoted as saying by broadcaster Globo G1. 
  
 "I kept watch on their houses and then after a while went there at dawn, waited for my chance and entered." 
  
 He added: "When I didn't do it I would get nervous, then I would go hunting" for other victims. 
  
 Das Gracas reportedly began a life of crime at the age of 15 snatching handbags and at 17 he allegedly killed his first victim. 
  
 "I don't feel remorse. If I go to jail for 10, 15, 20 years, then as soon as I get out I'll do the same thing all over again," he insisted. 
  
 Police said they were convinced by his account and were cross-referencing his confessions with past crime reports. Four crimes had already successfully been matched, they said. ||||| Media playback is unsupported on your device Media caption Ben Bland reports on the arrest of Sailson Jose das Gracas 
  
 Brazilian police have arrested a man who has confessed to the killing of 42 people over the last decade in the city of Rio de Janeiro. 
  
 Police say they arrested Sailson Jose das Gracas on Wednesday, shortly after he stabbed a woman to death in a city suburb. 
  
 He then confessed to killing another 37 women, three men and a two-year-old girl. 
  
 The police are searching for alleged victims and say they have found four. 
  
 In a police interview broadcast on Brazil's TV Globo, the man said he would go out hunting, and he killed for the adrenaline. 
  
 He told police that if he was ever released from prison he would kill again. 
  
 'Watched for months' 
  
 He said he preferred victims who were white females, whom he strangled. 
  
 His three male victims had been killed when he was operating for hire, he added. 
  
 Das Gracas said: " I would wait for an opportunity to break into the house and kill," adding that he would watch his victims for months before making his move. 
  
 Experts said Das Gracas appeared to be a psychopath who enjoyed the media spotlight and warned that what he said needed to be carefully checked. 
  
 Police said they had begun cross-referencing his confession with police reports and had already found four of his victims. 
  
 In October a security guard in the Brazilian city of Goiania confessed to killing 39 people. ||||| Sailson Jose das Gracas was arrested shortly after he allegedly stabbed a woman to death in the Rio de Janeiro suburb of Nova Iguacu. 
  
 "He confessed he killed another 37 women, three men and a two-year-old girl over the past nine years," a police officer said. "He either stabbed his victims or strangled them." 
  
 Inspector Pedro Henrique Medina told the G1 news portal that das Gracas showed no remorse and warned he would kill again if he was ever released from prison. 
  
 The 26-year-old told police he killed for “pleasure” and the “adrenaline” and also operated as a killer for hire, Reuters editorial reports. He claims he killed the first person, a woman, when he was just 17-years-old. 
  
 His preferred victims were females, whom he allegedly strangled. Among his 42 alleged killings, 39 are thought to be women, and one a two-year-old girl. 
  
 Das Gracas told reporters he would often watch those he claims to have attacked for months before making his move, saying: "I would wait for an opportunity to break into the house and kill. 
  
 Mug shot from Rio de Janeiro's police department showing Brazilian Sailson Jose das Gracas (AFP/ Getty Images) 
  
 "When I didn't do it I would get nervous, then I would go hunting [for other victims]”. 
  
 Das Gracas said he would often remove the nails of his victims to avoid marks or scratches from a scuffle. 
  
 Experts were quoted by news agencies as saying das Gracas was likely a psychopath who enjoyed the media spotlight and warned that his accounts should be carefully checked. 
  
 Police said they were cross referencing his confessions with past crime reports. They said four crimes had already successfully been matched. 
  
 Additional reporting by agencies |||||
Output:
When Brazilian police arrested Sailson Jose das Gracas Wednesday, after he allegedly stabbed a woman to death, they got more than they bargained for—much more. Das Gracas ultimately confessed to murdering another 41 people in Rio de Janeiro since 2005, 37 of them women, three men, and one a two-year-old girl, the BBC reports. He told police he watched his alleged victims for weeks or months, waiting "for an opportunity to break into the house and kill," and says he wore gloves and a rain jacket to help disguise himself. The 26-year-old said he would often strangle the women he killed, but that the men were killed when he was murdering for hire, and in those cases he used a gun. Police have started cross-referencing his confession with existing police reports, and say they have confirmed four of his alleged victims so far. If his confession proves true, he would be one of the country's "most prolific serial killers," Sky News reports. Officers say das Gracas told them he killed for the "fun of it," and experts say he appears to be a psychopath who is enjoying the attention he's receiving—so his confessions should be carefully investigated, they warn. He also warned police he would murder more people if released. A disturbing detail: The Independent reports that das Gracas said he often removed his victims' fingernails. (Another Brazilian 26-year-old recently confessed to 39 murders.)