Question: What is the former name of the episode of "The Simpsons" that was aired on the same day as the episode that was Billy Kimball's first writing credit?
Context: "You Kent Always Say What You Want", formerly known as "Kent State Massacre", is the twenty-second episode of "The Simpsons"<nowiki>'</nowiki> eighteenth season.  It originally aired on the Fox network in the United States on May 20, 2007 as part of the one-hour season finale, alongside the episode "24 Minutes"; a repeat took place on August 19, 2007.  It was the milestone 400th episode of "The Simpsons" and was written by Tim Long.  The episode guest starred Ludacris as himself and Maurice LaMarche as the Fox announcer.  It was the last episode to air prior to "The Simpsons Movie" releasing into theaters on July 27, 2007. Gregory Martin "Greg" Daniels (born June 13, 1963) is an American television comedy writer, producer, and director.  He is known for his work on several television series, including "Saturday Night Live", "The Simpsons", "Parks and Recreation", "King of the Hill" and "The Office".  All four shows were named among "Time"' s James Poniewozik's All Time 100 TV Shows.  Daniels attended Harvard University and he became friends with Conan O'Brien.  Their first writing credit was for "Not Necessarily the News", before they were laid off due to budget cuts.  He eventually became a writer for two long-running series: "Saturday Night Live" and "The Simpsons". "Smoke On The Daughter" is the fifteenth episode of "The Simpsons"<nowiki>'</nowiki> nineteenth season.  It originally aired on the Fox network in the United States on March 30, 2008, and was written by Billy Kimball (the only sole writing credit he has received for the show to date), and directed by Lance Kramer.  Lisa becomes a ballerina at an academy and discovers her natural talent is enhanced by second hand cigarette smoke.  Meanwhile, Homer shows Bart his secret room where he has secretly been making beef jerky and is torn when a family of raccoons steal it.  During the first broadcast, the episode was watched by 7.1 million people. "Gone Maggie Gone" is the thirteenth episode of "The Simpsons"<nowiki>'</nowiki> twentieth season.  It originally aired on the Fox network in the United States on March 15, 2009.  The episode was written by both Billy Kimball and longtime "Simpsons" writer Ian Maxtone-Graham, and directed by Chris Clements.  In the episode, Homer leaves Maggie on the doorstep of a convent, but when she disappears, Lisa goes undercover as a nun to solve the mystery and find her.  Meanwhile, Homer tries to keep Maggie's disappearance a secret from Marge, who was temporarily blinded while watching a solar eclipse. "24 Minutes" is the twenty-first episode of "The Simpsons"<nowiki>'</nowiki> eighteenth season.  It originally aired on the Fox network in the United States on May 20, 2007 as part of the one-hour season finale, alongside the episode "You Kent Always Say What You Want".  It was originally promoted as being the 400th episode, but was broadcast as the 399th.  It was written by Ian Maxtone-Graham and Billy Kimball.  It was Kimball's first writing credit. "On the Brink" is the fifth episode of series seven of the British espionage television series "Spooks", and the 60th episode overall.  It was originally broadcast on digital channel BBC Three on 10 November 2008, and repeated on frontline channel BBC One on 17 November.  The episode was written by Christian Spurrier, his first writing credit for the series, and directed by Edward Hall.  Set during the credit crunch, in this episode, Section D chief Ros Myers (Hermione Norris) works undercover to stop Alexis Meynell (Paul Rhys), a banker who is attempting to bankrupt the country.  Later, Ros discovers Meynell's motive. "The Yellow Badge of Cowardge" is the twenty-second episode and season finale of the 25th season of the American animated sitcom "The Simpsons", and the 552nd episode of the series.  It originally aired on the Fox network in the United States on May 18, 2014.  It was written by Billy Kimball and Ian Maxtone-Graham and directed by Timothy Bailey.  In the episode, Bart feels guilty after he wins the annual "last day of school" race around Springfield Elementary School, with help from Nelson, who beats up the frontrunner, Milhouse.  Meanwhile, Homer tries to bring back 4 July fireworks after they are canceled due to budget cuts. "Mrs. California" is the ninth episode of the eighth season of the American comedy television series "The Office", and the show's 161st episode overall.  "Mrs. California" aired on NBC in the United States on December 1, 2011.  The episode was written by consulting producer Dan Greaney, marking his first writing credit for the series, and was directed by Charlie Grandy. "New Guys" is the first episode of the ninth season of the American comedy television series "The Office", and the show's 177th episode overall.  It originally aired on NBC on September 20, 2012.  The episode was written and directed by series creator Greg Daniels; this is his first writing credit for the series since the seventh season episode "Goodbye, Michael", and his first directing credit since "PDA". "Hot Girl" is the sixth episode and season finale of the first season of the American comedy television series "The Office", and the show's 6th episode overall.  The episode aired on NBC in the United States on April 26, 2005.  The episode was written by consulting producer Mindy Kaling, marking her first writing credit for the series.  The episode was directed by Amy Heckerling, her only directing credit for the series.
Answer: "Kent State Massacre"