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- Until the summer of 2007: $2 for students, $3.50 for non-students
- Summer 2007 - Spring 2014: $2 for students, increased to $4 to include early rounds for others
- Circa 2012 or so: MIT students became free
- Summer 2014 - Spring 2023: free for MIT students, $2 for students and $5 for non-students.
- Summer 2023 - ??: free for MIT students, $2 for students, $5-10 for non-students
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