The runnable-combination count. Everything depends on the shared base/R hub, so for each hub version take the
product of how many versions of every other factor are compatible with it, and sum over the hub. With no hub the
factors are independent, so it is the plain product. (Constraints between two non-hub factors are not modelled.)
The runnable-combination count. Everything depends on the shared base/R
hub, so for each hub version take the product of how many versions of every other factor are compatible with it, and sum over the hub. With no hub the factors are independent, so it is the plain product. (Constraints between two non-hub factors are not modelled.)