We don't want to be too abstract, to get a feel for what we are doing, especially for collections and their different and possibly touchy algorithmic complexiti

We don't want to be too abstract, to get a feel for what we are doing, especially for collections and their different and possibly touchy algorithmic complexities, but if it makes sense we can use fooColl to reference a set as a general collection, for parts of the code that work well with any collection.