One column of what?

Fourteen rows of what?

Split what in half?

Are you trying to rearrange a table?

If so how should the items in the table be rearranged?

Your    Possible
Table   Results 
-----  ----- -----
  A     A B   A H 
  B     C D   B I 
  C     E F   C J 
  D     G H   D K 
  E     I J   E L 
  F     K L   F M 
  G     M N   G N 
  H    
  I    
  J    
  K    
  L    
  M    
  N
[download]

Here's some perl code that prints out simple tables from an array.

use strict;
use warnings;

my @stuff = 1..14;

# Print 14 rows in one column.
print "\n\n14 Rows\n";
print join "\n", @stuff;

# Print 7 rows two columns
print "\n\n7 Rows One Way\n";
print map { "$stuff[2*$_]\t$stuff[2*$_+1]\n" } 0..$#stuff/2;

print "\n\n7 Rows Another Way\n";
print map { "$stuff[$_]\t$stuff[$#stuff/2+$_+1]\n" } 0..$#stuff/2;
[download]

You won't be able to write a program in any language unless you can clearly describe what you want to do in any suitable human language (such as English).

Start your program by writing comments:

# Open a text file
# Read the file
# Print file contents out like this
# LINE_1  LINE_2
# LINE_3  LINE_4
[download]

Then start filling in the Perl between the comments.

If you get stuck, try posting a clear question with your code so far, and you'll have much better luck.

Happy hacking. When I was starting out, I found How to RTFM to be a very useful post. Note that perldoc.com is long gone, so use http://perldoc.perl.org to find perldoc on the web.