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The Big Bang Theory (OAD: )

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The Big Bang Theory : The Cohabitation Formulation


Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship.

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Previous Episode

The Benefactor Factor

(First Aired: February 10, 2011)

A wealthy donor makes Leonard question what he is willing to do for science.

Next Episode

The Toast Derivation

(First Aired: February 24, 2011)

Sheldon is upset when he realizes Leonard is the center of their group of friends.