Here, the title of this article is formed by creating a sentence of the form 'noun phrase'+'preposition'+'compound noun' (abbreviated as NP, Pre and CN, respectively). Subsequently, NP and CN are further specified: The former consists of an adjective (Adj) and a plural noun (PlN), while the latter consists of two singular nouns (SiN). Finally, these placeholders are replaced by actual english words so that Pre becomes in, Adj becomes heterogeneous, etc.