Ability to show newspaper style columnar text

In certain (rarer) situations, it may be desirable to show braille in multiple columns, a bit like newspaper style columnar text. The text runs fully down the left side of the paper and then the right.

An example might be where there are many very short lines (e.g. a summary of braille contractions, or perhaps a list of words).

B--but
C--can
D--do
E--every
F--from
G--go
...
X--it
Y--you
Z--as

In order to save space on standard width paper, this would be shown as two columns, e.g.:

B--but P--people
C--can Q--quite
D--do R--rather
... ...
L--like Y--you
M--more Z--as
N--not

If the line length is reduced, this should automatically become a single column of text with all the lines in the right order.

Proposal:
Markup for multi-column text - not the same as a table.