Command line help - append to new column for each unique ID topic

Hi.

I have 30 txt files with two columns much like this example.

What command line command would i used to achieve this?

Nicolai

A	1				A	1	2	3	4	5	6
A	2				B	1	2	3	4	5
A	3				C	1	2	3	4
A	4				D	1	2	3	4	5	6
A	5
A	6
B	1
B	2
B	3
B	4
B	5
C	1
C	2
C	3
C	4
D	1
D	2
D	3
D	4
D	5
D	6