Definition: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: Customs And Border Protection Outlines Border Wall Requirements 
  
 Enlarge this image toggle caption John Moore/Getty Images John Moore/Getty Images 
  
 U.S. Customs and Border Protection is asking for design proposals and prototypes of President Trump's proposed wall on the U.S.-Mexico border. 
  
 Late Friday, the agency released specifics for the first time on how tough the barrier must be. CBP posted online two different options for contractors: one proposal must be for a solid concrete wall, another is for a wall with "a see-through component/capability" that is "operationally advantageous." 
  
 "The wall design shall be physically imposing in height," the CBP outlines say. The government says its "nominal concept" is for a 30-foot-high wall, but adds that designs as low as 18 feet "may be acceptable." 
  
 The proposal document asks contractors for 30-foot-long prototypes and mock-ups of 10 feet by 10 feet. 
  
 A CBP official told NPR's John Burnett that contractors will have to make mock-ups of their ideas in San Diego. "It's a way for the agency to identify designs. We're looking for industry's designs, to take a fresh look at the wall. We'll have industry propose and then we'll down-select." 
  
 The CBP, which is part of the Department of Homeland Security, requires the wall designs to be impossible for humans to climb without a ladder. It wants proposals that will prevent people from tunneling underneath by at least 6 feet underground. 
  
 The government outlines the types of things both types of walls have to stand up to: "sledgehammer, car jack, pick axe, chisel, battery operated impact tools, battery operated cutting tools, Oxy/acetylene torch or other similar hand-held tools." 
  
 Politics Rush Begins For Contractors Who Want In On Border Wall Construction Rush Begins For Contractors Who Want In On Border Wall Construction Listen · 3:28 3:28 
  
 It has to look good, too. "The north side of wall (i.e. U.S. facing side) shall be aesthetically pleasing in color, anti-climb texture, etc., to be consistent with general surrounding environment," the CBP says. There's no mention of the aesthetics on the Mexican side. 
  
 More than 400 companies have told the Department of Homeland Security they're interested in the project, NPR's Richard Gonzales reported last week. Cost estimates of the wall vary widely: President Trump said it would cost $12 billion; an MIT study said $38 billion. 
  
 The deadline for contractors to submit their proposals for the first phase is March 29. 
  
 NPR's John Burnett contributed to this report. ||||| President Donald Trump's campaign promise to build a wall along the U.S.-Mexico border came one step closer Friday to becoming a reality. 
  
 The Department of Homeland Security's law enforcement agency, U.S. Customs and Border Protection, released two formal requests for prototypes of a southern border wall. 
  
 The RFPs shed additional light on the Trump administration's plans for a wall, including its height, aesthetics and anti-climb features. The budget blueprint the White House released Thursday includes $4.1 billion for the wall. 
  
 "CBP issued two RFPs to acquire multiple conceptual wall designs with the intent to construct multiple prototypes," the agency says in a press release. "Prototyping is an industry-tested approaches to identify the best solution when considering a new product or methodology. Through the construction of prototypes, CBP will partner with industry to identify the best means and methods to construct border wall before making a more substantial investment in construction." 
  
 One Request for Proposal (RFP) is for a concrete wall, while the other is for other types of barriers. 
  
 The concrete wall RFP states, "the wall design shall be reinforced concrete" and "be physically imposing in height." 
  
 What constitute's "imposing?" According to the RFP, "the government's nominal concept is for a 30-foot high wall." But there's wiggle room. "Offerors should consider this height, but designs with heights of at least 18 feet may be acceptable. Designs with heights of less than 18 feet are not acceptable." 
  
 A key aspect to the concrete wall's design is that it is impossible for individuals to find a way to get over -- or under -- the wall. 
  
 "It shall not be possible for a human to climb to the top of the wall or access the top of the wall from either side unassisted (e.g. via the use of a ladder, etc.)," reads the RFP. "The wall design shall include anti-climb topping features that prevent scaling using common and more sophisticated climbing aids (e.g. grappling hooks, handholds, etc.)" 
  
 And the agency is also aware that some individuals may try and go under the wall. "The wall shall prevent digging or tunneling below it for a minimum of 6 feet below the lowest adjacent grade," reads the RFP. 
  
 And don't even think about breaching the wall. "The wall shall prevent/deter for a minimum of 1 hour the creation a physical breach of the wall (e.g., punching through the wall) larger than 12-inches in diameter or square using sledgehammer, car jack, pick axe, chisel, battery operated impact tools, battery operated cutting tools, Oxy/acetylene torch or other similar hand-held tools." 
  
 While the wall will serve a functional purpose, the CPB isn't completely putting substance over style, 
  
 "The north side of wall (i.e. U.S. facing side) shall be aesthetically pleasing in color, anti-climb texture, etc., to be consistent with general surrounding environment," reads the RFP. It's unclear what the view from Mexico will be. 
  
 ABC News' Jack Date contributed to this report. ||||| Washington (CNN) It should be tall, climb-resistant, difficult to penetrate and blend into the landscape. 
  
 Those are among the requirements for the US-Mexico border wall released by the federal government late Friday, kicking off a bidding process that will lead to one of the largest government construction projects in US history. 
  
 "The wall design shall be physically imposing in height," Customs and Border Protection outlined in the notice for contractors. That means 30 feet tall, although the officials wrote that "designs with heights of at least 18 feet may be acceptable." 
  
 The wall must also be impossible to climb without a ladder, and should make it difficult to use "common and more sophisticated climbing aids," like grappling hooks. 
  
 In addition, the wall must resist attempts to penetrate through or under it. The request specifically mentions it must successfully endure for at least 30 minutes -- but ideally more than four hours -- attempts to bore through it with a "sledgehammer, car jack, pick axe, chisel, battery operated impact tools, battery operated cutting tools, Oxy/acetylene torch or other similar hand-held tools." 
  
 Among the requirements is that the wall be "aesthetically pleasing in color" and blend into or match the surrounding landscape on the US side. It does not address the aesthetics of the Mexican side. 
  
 After initially saying the wall should be made of concrete, the government widened its call and said it would consider "other designs." On Friday, it suggested non-concrete designs "may not be entirely solid" and could feature "a see-through component" so the border patrol would have "situational awareness" of the Mexican side. 
  
 The specifications leave nearly all of the design work to interested bidders, who now have about two weeks to develop and submit their plans, known as proposals. A federal contracting expert told CNN this approach is common when the government knows generally what it wants, but is interested in seeing different ideas to accomplish the goals. 
  
 It will select from those proposals several 30-foot-long prototypes to be built. Each prototype is expected to cost between $200,000 and $500,000, the government notice said. Companies will also build smaller 10-foot models for penetration tests. 
  
 The prototypes will be used to decide upon a design for the wall that ultimately is constructed along the border. 
  
 The wall -- and having Mexico pay for it -- was a central promise President Donald Trump made on the campaign trail. The government's proposal reflects many of his campaign promises, including that the wall be tall and "beautiful." It also includes a provision that contractors use American materials whenever possible. 
  
 Friday's release did not address the overall cost of the wall. Various estimates have put the project at between $10 billion and $25 billion. Trump's recent budget proposal requested $1 billion to begin the process. 
  
 In recent weeks, hundreds of companies indicated interest in the project. One construction contracting expert told CNN, however, that there are only a handful of construction firms with the size, capability and experience to handle such a large-scale contract. The expert pointed to federal requirements that contractors set aside substantial amounts of money as a guarantee that the project is completed satisfactorily. 
  
 As is standard with government contracts, a secretive selection committee will evaluate the proposals based on the merits of the design and the contractors' ability to complete the job. The committee will select up to 20 plans to move to the next phase, where contractors detail how much their plans will cost and answer other questions. 
  
 Multiple contracts to build wall prototypes will then be issued, the government has said. It hinted that bidding may be reopened in the future, saying the current process "is not intended as the vehicle for the procurement of the total wall solution for the border with Mexico." |||||
Output:
We now have an idea of what President Trump's "big, beautiful wall" is going to look like after US Customs and Border Protection released two requests for prototypes Friday night, ABC News reports. According to NPR, Customs and Border Protection is asking contractors to mock-up one of two types of walls: a solid concrete wall or a wall with a "see-through component." The government wants the wall be "physically imposing in height," ideally 30-feet tall (thought it would settle for 18). It must be impossible to climb without a ladder or tunnel underneath up to 6 feet below ground. It also must stand up to attacks from sledgehammers, pick axes, torches, and other tools for at least 30 minutes (though four hours would be better), according to CNN. The requests for prototypes also stipulate the wall must be "aesthetically pleasing," at least on the side that faces the US. More than 400 companies have expressed interest in building Trump's wall. They're being asked to build 30-foot-long prototypes in San Diego for Customs and Border Protection to analyze. The deadline for proposals is March 29. While Trump has put the cost of the wall at $12 billion, a recent MIT study says it'll be closer to $38 billion. Trump's proposed budget includes $3.1 billion in funding for the wall. Regardless of the final cost, the wall is on track to be one of the biggest construction projects ever undertaken by the US government.