That little old “space key” or its absence can matter, a lot.
Abbreviations can drive one crazy, especially when searching online, either on the free web or in subscription databases. Those of us in the digital searching world know that searching for something by its abbreviation is an exercise in frustration. (Librarians (almost) never give up so it’s not an exercise in futility. We WILL FIND that document, if we have to die (figuratively speaking) trying.)
Most of us vividly remember searches where we had to try a dozen variations on a theme in the effort to locate a case, a person, or a document, where the only unique “name” was an abbreviation.