Need your help: Excel file needs to be sorted for a school project.

Hello,
I really do need your help for a school project:

My data is organized this way:

02 055 0312 ...
0121 03 654 ...
88 05 015 ...


The data needs to be transformed into this order:

row1 02
row1 055
row1 0312
row2 0121
row2 03
row2 654
row3 88
row3 05
row3 015
...


Anyone able to help me with this task?