UNION from 1 crazy dataset

Hi all

here is my problem on this friday evening : i've got a weird dataset as an input

What i'd like to do is to say (in M) :

"ok column 2-3-4, you stick your a** in that table. Next : columns 4-5-6, you go under 2-3-4 etc..."

Nice output table =

col2-col3-col4

union

col5-col6-col7

union

col8-col9-col10

etc...

There are like 200 columns in that damned file !!!

one day these users will kill me  :)

Thank you for your help !