Input: Read this: In 2006, Beyonce introduced her all-female tour band Suga Mama (also the name of a song in B'Day) which includes bassists, drummers, guitarists, horn players, keyboardists and percussionists. Her background singers, The Mamas, consist of Montina Cooper-Donnell, Crystal Collins and Tiffany Monique Riddick. They made their debut appearance at the 2006 BET Awards and re-appeared in the music videos for "Irreplaceable" and "Green Light". The band have supported Beyonce in most subsequent live performances, including her 2007 concert tour The Beyonce Experience, 20092010 I Am... World Tour and 20132014 The Mrs. Carter Show World Tour.
Question: What band did Beyonce introduce in 2006?

Output: Suga Mama

Input: Read this: Fluids cannot generally be pulled, so a vacuum cannot be created by suction. Suction can spread and dilute a vacuum by letting a higher pressure push fluids into it, but the vacuum has to be created first before suction can occur. The easiest way to create an artificial vacuum is to expand the volume of a container. For example, the diaphragm muscle expands the chest cavity, which causes the volume of the lungs to increase. This expansion reduces the pressure and creates a partial vacuum, which is soon filled by air pushed in by atmospheric pressure.
Question: What can be used in a chest cavity during surgery?

Output: unanswerable

Input: Read this: Arsenal's financial results for the 201415 season show group revenue of 344.5m, with a profit before tax of 24.7m. The footballing core of the business showed a revenue of 329.3m. The Deloitte Football Money League is a publication that homogenizes and compares clubs' annual revenue. They put Arsenal's footballing revenue at 331.3m (435.5m), ranking Arsenal seventh among world football clubs. Arsenal and Deloitte both list the match day revenue generated by the Emirates Stadium as 100.4m, more than any other football stadium in the world.
Question: Who ranks first in revenue for world football clubs?

Output: unanswerable

Input: Read this: Changes to DST rules cause problems in existing computer installations. For example, the 2007 change to DST rules in North America required many computer systems to be upgraded, with the greatest impact on email and calendaring programs; the upgrades consumed a significant effort by corporate information technologists.
Question: In addition to calendaring programs, what kind of programs were most impacted by the changes?

Output:
email