How many Perks can you start a run with?

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I was able to choose 4 perks before starting an adventure. But after beating the game once I can now pick 5 perks. I am not sure if that was the actual way I earned the extra slot but it was when I noticed. What is the maximum number of perks I will be able to start an adventure with?
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Images: Pixabay, Andrea Piacquadio, Andrea Piacquadio, Tim Gouw