It is very important write your articles within the occurrence matrix.
It is a type of indexing that allows Google to deliver search results that attempt to mimic the way a person would answer the same question. It is a step closer to humanizing the internet's largest index of information. Latent Symantec Indexing can relate search terms to concepts.
It also is used to kill spammers. It will measure authority documents that become benchmark documents. Concurrences of terms are watched closely. Cross the line and chances are Google will discount (throw in the trash) your article?