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In the 'Chaos is a ladder' exchange between Varys and Littlefinger in season 3 episode 6 this line came up in the dialogue:
Petyr 'Littlefinger' Baelish: You're so right. For instance, when I thwarted your plan to give Sansa Stark to the Tyrells, if I'm going to be honest, I did feel an unmista...