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BSD 4.3

procedure main()
   writes("specify input file: ")
   repeat {
      if intext := open(read()) then break
      writes("cannot open input file, respecify: ")
      }
   writes("specify output file: ")
   repeat {
      if outtext := open(read(),"w") then break
      writes("cannot open output file, respecify: ")
      }
   while write(outtext,read(intext))
end

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