At first glance this strikes me as more evidence for something we’ve known for quite a while. It’s related to chunking, the grouping of objects so that more can be kept in working memory. (Remembering the sequence phdfbinasamooc is difficult, but remembering phd fbi nasa mooc is not.) It also relates to the old misplaced modifier rule in writing good sentences—keep the modifiers close to the noun they modify. It’s interesting, but not earth shattering.