batch increment variable string

I need your help please. I have a problem with concatenate.

SET /A "index=1"

for /f "skip=%index%" %%G IN (anoiarseeds.txt)   DO if not defined var%index% set "var%index%=%%G"

This code is working but the problem in the next step how can I echo the value of var%index% ?

%var%%index% doesn't work.

!%var%%index%%! doesn't work either.