[Gretl-users] multiple indexes for variables?

Hi, I was wondering if it was possible, when constructing loops, to have 2 or several indexes in order to differenciate between different sets of variables. For instance, is it possible to run OLS estimation repetitively taking each time a different dependent variable indexed by i, and a different independent variable indexed by j in another list of variables ? This would amount to having a loop on j within a loop concerning i. Arnaud