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#[cfg(feature = "astronomy")] pub mod astronomy; #[cfg(feature = "biology")] pub mod biology; #[cfg(feature = "chemistry")] pub mod chemistry; #[cfg(feature = "geology")] pub mod geology; #[cfg(feature = "maths")] pub mod maths; #[cfg(feature = "meteorology")] pub mod meteorology; #[cfg(feature = "physics")] pub mod physics; pub mod constants;