As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
| Title | The Cohabitation Formulation |
|---|---|
| Genres | Comedy |
| Release Date | 2011-02-17 |
| Episode Runtime | 00 Hours 22 Minutes |
| Season Number | 4 |
| Episode Number | 16 |
| Production Companies | Chuck Lorre Productions, Warner Bros. Television |
