diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index b21cc6a..29a52e3 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -2,6 +2,15 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "once_cell"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"
+
 [[package]]
 name = "rust"
 version = "0.1.0"
+dependencies = [
+ "once_cell",
+]
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 84a8d29..6c42619 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -5,4 +5,5 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
-[dependencies]
\ No newline at end of file
+[dependencies]
+once_cell = "1.10.0"
diff --git a/rust/tests/9_if_you_can_reed_this.rs b/rust/tests/9_if_you_can_reed_this.rs
new file mode 100644
index 0000000..73c0ce5
--- /dev/null
+++ b/rust/tests/9_if_you_can_reed_this.rs
@@ -0,0 +1,54 @@
+use once_cell::sync::Lazy;
+use std::collections::HashMap;
+
+#[rustfmt::skip]
+pub static NATO: Lazy<HashMap<char, &'static str>> = Lazy::new(|| {
+    [
+        ('A', "Alfa"), ('B', "Bravo"), ('C', "Charlie"), ('D', "Delta"),
+        ('E', "Echo"), ('F', "Foxtrot"), ('G', "Golf"), ('H', "Hotel"),
+        ('I', "India"), ('J', "Juliett"), ('K', "Kilo"), ('L', "Lima"),
+        ('M', "Mike"), ('N', "November"), ('O', "Oscar"), ('P', "Papa"),
+        ('Q', "Quebec"), ('R', "Romeo"), ('S', "Sierra"), ('T', "Tango"),
+        ('U', "Uniform"), ('V', "Victor"), ('W', "Whiskey"), ('X', "Xray"),
+        ('Y', "Yankee"), ('Z', "Zulu"),
+    ]
+    .iter()
+    .copied()
+    .collect()       
+});
+
+fn to_nato(words: &str) -> String {
+    words
+        .to_uppercase()
+        .chars()
+        .filter(|c| !c.is_whitespace())
+        .map(|c| match NATO.get(&c) {
+            Some(w) => w.to_string(),
+            None => c.to_string(),
+        })
+        .collect::<Vec<_>>()
+        .join(" ")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::to_nato;
+
+    #[test]
+    fn base_to_nato() {
+        assert_eq!(
+            to_nato("If you can read"),
+            "India Foxtrot Yankee Oscar Uniform Charlie Alfa November Romeo Echo Alfa Delta"
+        );
+
+        assert_eq!(
+            to_nato("Did not see that coming",),
+            "Delta India Delta November Oscar Tango Sierra Echo Echo Tango Hotel Alfa Tango Charlie Oscar Mike India November Golf"
+        );
+
+        assert_eq!(
+            to_nato("go for it!"),
+            "Golf Oscar Foxtrot Oscar Romeo India Tango !"
+        );
+    }
+}