The phrase "to complete the set" refers to finishing a group of things or achieving all the elements necessary for a collection to be considered whole. Full definition
These programs are difficult to navigate and access, with competing sets of rules that affect borrowers in ways that are hard to predict. (educationnext.org)
Two groups of states are working to develop competing sets of tests based on the Common Core standards. (pewtrusts.org)
There are also a few compete sets of all four prints available. (gabbagallery.com)