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diff --git a/my_crate/src/lib.rs b/my_crate/src/lib.rs
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+////! # My crate
+////!
+////! `my_crate` is a collection of utilities to make performing certain
+////! calculations more convenient.
+
+///// Adds one to number given.
+/////
+///// # Examples
+/////
+///// ```
+///// let arg = 5;
+///// let answer = my_crate::add_one(arg);
+/////
+///// assert_eq!(6, answer);
+///// ```
+//pub fn add_one(x: i32) -> i32 {
+//    x + 1
+//}
+
+//! # Art
+//!
+//! A library for modeling artistic concepts.
+
+pub use self::kinds::PrimaryColor;
+pub use self::kinds::SecondaryColor;
+pub use self::utils::mix;
+
+pub mod kinds {
+    /// The primary colors according to the RYB color model.
+    pub enum PrimaryColor {
+        Red,
+        Yellow,
+        Blue,
+    }
+
+    /// The secondary colors according to the RYB color model.
+    pub enum SecondaryColor {
+        Orange,
+        Green,
+        Purple,
+    }
+}
+
+pub mod utils {
+    use crate::kinds::*;
+
+    /// Combines two primary colors in equal amounts to create
+    /// a secondary color.
+    pub fn mix(c1: PrimaryColor, c2: PrimaryColor) -> SecondaryColor {
+        // --snip--
+        SecondaryColor::Orange
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}