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Season 8, Episode 13
Airing: February 2, 2012
If/Then
Meredith dreams about what-ifs in flashbacks. Among them: Her mother remained happily with her father and didn't get Alzheimer's; she hadn't met Derek in a bar, and he stayed with Addison; Bailey had remained as meek as she was as an intern; and Callie and Owen had become a couple long before she met Arizona.