How to define variables of a nested (!) for loop?

[Dennis Halver]

How to define variables of a nested (!) for loop?

The following does NOT work:

setlocal enabledelayedexpansion

set aaa=unknown
set bbb=dummy
for /F "tokens=2-4 " %%A in (......) DO (
set aaa=%%A %%B %%C
for /f "tokens=1-4" %%i in (....) do (
set bbb=%%i %%j %%k %%l
...)
...
)

This does not work as well:

set aaa=unknown
set bbb=dummy
for /F "tokens=2-4 " %%A in (...) DO (
set aaa=%%A %%B %%C
for /f "tokens=1-4" %%i in (....) do (
set bbb=%%%i %%%j %%%k %%%l
...)
...
)

So how is the correct declaration of loop variables of inner loop?

Dennis