Tx for the scripts. However, I have another problem, which is related to the previous one. For example, if I have this file:

file1
aa A 3
aa B 4
aa C 5
bb X 6
bb Y 7
bb Z 8
cc O 9
cc P 10
cc Q 11
. .
. .
. .
. .

and I want to turn them into a connection nodes like this:
file2

A aa A 3 3
A aa B 3 4
A aa C 3 5
B aa C 4 5
B aa B 4 4
C aa C 5 5
X bb X 6 6
X bb Y 6 7
X bb Z 6 8
Y bb Z 7 8
Y bb Y 7 7
Z bb Z 8 8
. . .
. . .
. . .
. . .

I made this relation, to create a graph. Like before, The file could have more than 100.000 lines. Any suggestion to modify the script, or to create a new one? Tx