original_query: When did the 2021-2022 Columbia University strike begin and end?
query: When did the 2021-2022 Columbia University strike begin and end?
answer: The 2021-2022 Columbia University strike began on March 15, 2021, and ended on May 13, 2021.  However, a second strike occurred from November 3, 2021 to January 7, 2022.