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  1. or download this
    a1    b1    c1    d1
    a2    b2    c2    d2
    a3    b3    c3    d3
    a4    b4    c4    d4
    
  2. or download this
    #!/usr/bin/perl
    open (datafile, "file_A.txt");
    ...
    close(NF);
    close(OF);