Database: scholar_minus_1_5
Question: keyphrases used by dan klein in his emnlp papers
SQL: select distinct t1.keyphraseid from paper_paperkeyphrase as t1 join venue as t2 on t1.venueid = t2.venueid join writes as t3 on t1.paperid = t3.paperid join author as t4 on t3.authorid = t4.authorid where t4.authorname = 'dan klein' and t2.venuename = 'emnlp' ;