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    if ((fd_1 = open(input_file, O_RDONLY)) < 0) {
          fprintf(stderr,"Cannot open input file %s: %s\n",
                  input_file, strerror(errno));
          exit(1);
      }
    if ((fd_2 = open(ouput_file, O_WRONLY)) < 0) {
          fprintf(stderr,"Cannot open ouput file %s: %s\n",
                  input_file, strerror(errno));
          exit(1);
      }
      i = 0;
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