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Leonard announces that the professor who was to attend a conference in Switzerland and visit CERN's Large Hadron Collider is unable to go, so he (Leonard) has been designated to be the replacement, and he gets to take one guest with him. Sheldon is pleased, assuming that he will be Leonard's guest because they have a roommate agreement that if one roommate gets invited to see the Collider, he would invite the other (Sheldon having always wanted t...

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