nl_tokens: This contains all possible default researches .
pl_tokens: <mask> ( paper ) { this . setPaper ( paper ) ; this . defaultResearches = { urlLength : urlLength , wordCountInText : wordCountInText , findKeywordInPageTitle : findKeywordInPageTitle , calculateFleschReading : calculateFleschReading , getLinkStatistics : getLinkStatistics , getLinks : getLinks , linkCount : linkCount , imageCount : imageCount , altTagCount : altTagCount , matchKeywordInSubheadings : matchKeywordInSubheadings , keywordCount : keywordCount , getKeywordDensity : getKeywordDensity , stopWordsInKeyword : stopWordsInKeyword , stopWordsInUrl : stopWordsInUrl , metaDescriptionLength : metaDescriptionLength , keyphraseLength : keyphraseLength , keywordCountInUrl : keywordCountInUrl , firstParagraph : findKeywordInFirstParagraph , metaDescriptionKeyword : metaDescriptionKeyword , pageTitleWidth : pageTitleWidth , wordComplexity : wordComplexity , getParagraphLength : getParagraphLength , countSentencesFromText : countSentencesFromText , countSentencesFromDescription : countSentencesFromDescription , getSubheadingTextLengths : getSubheadingTextLengths , findTransitionWords : findTransitionWords , passiveVoice : passiveVoice , getSentenceBeginnings : getSentenceBeginnings , relevantWords : relevantWords , readingTime : readingTime , getTopicDensity : getTopicDensity , topicCount : topicCount , sentences , keyphraseDistribution : keyphraseDistribution , morphology : morphology , functionWordsInKeyphrase : functionWordsInKeyphrase , h1s : h1s , } ; this . _data = { } ; this . customResearches = { } ; }