|Information Materials (various articles by the journals)||20,212,313|
|Deleted (e.g., deleted DOIs, but not retracted)||1,760,759|
|Non-English Research Article||4,795,850|
|Unique Count||Total Count|
 Only common subjects/objects (1,209,485) were used for the linguistic analysis.
 Only main verbs of the sentences are counted. For example, in the sentence "I was told"; there is only one verb: "to tell"; "to be" is part of the main verb's tense.
 Adverbs are counted when modifying the main. For example, in the sentence "We built a chemically modified electrode.", "chemically" is part of the "chemically modified electrode" object. The same apply to the verb, "to modify".
 Adjectives are normally part of the subjects/objects, and are used for further parsing of the corresponding components.