nl_tokens: Returns the sentences from a certain block .
pl_tokens: function getSentencesFromBlock ( block ) { const sentenceTokenizer = <mask> SentenceTokenizer ( ) ; const { tokenizer , tokens } = sentenceTokenizer . createTokenizer ( ) ; sentenceTokenizer . tokenize ( tokenizer , block ) ; return tokens . length === 0 ? [ ] : sentenceTokenizer . getSentencesFromTokens ( tokens ) ; }