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Tease Your Brain!

It was vacation time, and so I decided to visit my cousin's home. In the mornings, we both would go for a jog. The evenings were spent on the tennis court. Tiring as these activities were, we could manage only one per day, i.e., either we went for a jog or played tennis each day. There were days when we felt lazy and stayed home all day long.

Now, there were 9 mornings when we did nothing, 14 evenings when we stayed at home, and a total of 13 days when we jogged or played tennis. How many days did I stay at my cousin's place?