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The package gnopernicus in the gnome-extra group depends on gnome-speech package which doesn't exist. Neither the package itself exists nor does have an entry in the database file.
pacman -Si gnopernicus
You'll find that it depends on gnome-speech
pacman -Si gnome-speech
You'll find that it doesn't exist
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same here
...you could just say no when it asks if it wants to install that package
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