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  1. or download this
    use Tie::File;
    use strict;
    ...
    ## We remove those that didn't match by replacing @A with @C :)
    @A = @C;
    print @A;
    
  2. or download this
    filea:file2:file1
    file2:something:old
    
  3. or download this
    fileB:file2:file3
    filea:file2:file1
    ...
    filea:file2:file1
    file2:filex:file23