Database: icfp_1

Question: Find the last names of all the authors that have written a paper with title containing the word "Monadic".
SQL: SELECT t1.lname FROM authors AS t1 JOIN authorship AS t2 ON t1.authid  =  t2.authid JOIN papers AS t3 ON t2.paperid  =  t3.paperid WHERE t3.title LIKE "%Monadic%"