Currently, we have: ``` list string varying_settings = [ "" ]; ``` ``` string disable_settings_to_vary = ""; ``` ``` list string extra_settings = [ "" ]; ``` We make a product of the first and third one, with the 2nd one always prepended to it. I propose to generalize this to: ``` list list settings_to_combine; ``` Then we allow for instance: ``` list list string settings_to_combine = [ ["--adv-var-order=\""], ["model", "sorted"], [" -> dcsh -> force -> slidwin", " -> force -> slidwin"], ["\""], ]; ``` Which results in: ``` ["--adv-var-order=\"model -> dcsh -> force -> slidwin", "--adv-var-order=\"model -> force -> slidwin", "--adv-var-order=\"sorted -> dcsh -> force -> slidwin", "--adv-var-order=\"sorted -> force -> slidwin"] ``` This is much more flexible than what we have now.