<|im_start|>system
You are a helpful AI assistant.<|im_end|>
<|im_start|>user
What was the capital of Poland in 1640?<|im_end|>
<|im_start|>assistant
Warsaw.

It became the capital of Poland-Lithuania Commonwealth in 1596.

It was chosen as the capital because it was the mid-point between the then Polish capital Cracow, and Lithuanian capital Vilnius.<|im_end|>