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^^
These p3a archives are made with dictionary ZSTD just like Zelda Tears of the Kingdom files.
You can rebuild the archives using p3a_tool and decide for no compression. If you decide on the zstd compression with p3a_tool, you still need to brute force a stream to figure out what version and settings for ZSTD were used.
I think there is more than one dictionary, they can be dumped from memory at runtime but that's about as far as I have got.
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