How many episodes was Prison Break originally planned for?

I thought it was 13, but due to the success of Prison Break, it was to go on for an extra 9 episodes.
But some people have said it was always planned for 22.

Prison Break was originally planned for a 13-episode run, but was extended to include an extra nine episodes due to its popularity. - Wikipedia.org.

But does anyone know? I am still wondering if there will be a fifth season of Prison Break.


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