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Harvard's residential houses and Yale's residential colleges have established sisterly relationships, much like the Oxbridge sister colleges. These twinings are rarely invoked nowadays, except on the weekend of the Game when some houses/colleges find accommodation for visiting rival fans. (Although Harvard has 13 houses and Yale only 12 colleges, Dudley house has only a handful of undergraduates, and is doubled-up with Pforzheimer as sisters of Silliman, a relatively large Yale college.)
| Harvard house | Yale college |
|---|---|
| Adams | Saybrook |
| Cabot | |
| Currier | Ezra Stiles |
| Dudley | Silliman (1) |
| Dunster | Berkeley |
| Eliot | Johnathan Edwards |
| Kirkland | Calhoun |
| Mather | |
| Leverett | Timothy Dwight |
| Lowell | |
| Pforzheimer | Silliman (2) |
| Quincy | Branford |
| Winthrop | Davenport |
| ? | Morse |
| ? | Pierson |
| ? | Trumbull |
Although some of these houses and colleges have established links to various Oxford and Cambridge colleges, the ties are not transitive; so it is impossible to make a four-column chart.