Sorry your problem is still rather underspecified.
I can't  work out from yoru description which order you want the
entries. 
normally "two column" refers to an ordering 
1 4
2 5
3 6

that is, one reads the whole of the first column before reading the 2nd. 

But your comments about looking at pairs implies that pehaps you mean to
set things up as

1 2
3 4
5 6


which is a "two column table" but not really a 2 column layout in the
sense of a newpaper column.

I think probably you want this last form, except that you want a
spanning entry for long entries, so if 3 is long you want

1 2
333
4 5
6

and if 4 is long you want


1 2
333
444
5 6

David

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