diff --git a/src/assignments/assignment01.rs b/src/assignments/assignment01.rs
index 5d04702..058e21a 100644
--- a/src/assignments/assignment01.rs
+++ b/src/assignments/assignment01.rs
@@ -6,14 +6,14 @@
 //! You should fill out `add()` and `sub()` function bodies in such a way that `/scripts/grade-01.sh` works fine.
 //! See `assignment01_grade.rs` and `/scripts/grade-01.sh` for the test script.
 //!
-//! Hint: https://doc.rust-lang.org/std/primitive.usize.html
+//! Hint: <https://doc.rust-lang.org/std/primitive.usize.html>
 
 /// Adds two unsigned words. If overflow happens, just wrap around.
-pub(crate) fn add(lhs: usize, rhs: usize) -> usize {
+pub fn add(lhs: usize, rhs: usize) -> usize {
     todo!()
 }
 
 /// Subtracts two unsigned words. If overflow happens, just wrap around.
-pub(crate) fn sub(lhs: usize, rhs: usize) -> usize {
+pub fn sub(lhs: usize, rhs: usize) -> usize {
     todo!()
 }
diff --git a/src/assignments/assignment02.rs b/src/assignments/assignment02.rs
index a5fc2b9..e0944eb 100644
--- a/src/assignments/assignment02.rs
+++ b/src/assignments/assignment02.rs
@@ -12,36 +12,36 @@ const FAHRENHEIT_OFFSET: f64 = 32.0;
 const FAHRENHEIT_SCALE: f64 = 5.0 / 9.0;
 
 /// Converts Fahrenheit to Celsius temperature degree.
-pub(crate) fn fahrenheit_to_celsius(degree: f64) -> f64 {
+pub fn fahrenheit_to_celsius(degree: f64) -> f64 {
     todo!()
 }
 
 /// Capitalizes English alphabets (leaving the other characters intact).
-pub(crate) fn capitalize(input: String) -> String {
+pub fn capitalize(input: String) -> String {
     todo!()
 }
 
 /// Returns the sum of the given array. (We assume the absence of integer overflow.)
-pub(crate) fn sum_array(input: &[u64]) -> u64 {
+pub fn sum_array(input: &[u64]) -> u64 {
     todo!()
 }
 
 /// Given a non-negative integer, say `n`, return the smallest integer of the form `3^m` that's greater than or equal to `n`.
 ///
 /// For instance, up3(6) = 9, up3(9) = 9, up3(10) = 27. (We assume the absence of integer overflow.)
-pub(crate) fn up3(n: u64) -> u64 {
+pub fn up3(n: u64) -> u64 {
     todo!()
 }
 
 /// Returns the greatest common divisor (GCD) of two non-negative integers. (We assume the absence of integer overflow.)
-pub(crate) fn gcd(lhs: u64, rhs: u64) -> u64 {
+pub fn gcd(lhs: u64, rhs: u64) -> u64 {
     todo!()
 }
 
 /// Returns the array of nC0, nC1, nC2, ..., nCn, where nCk = n! / (k! * (n-k)!). (We assume the absence of integer overflow.)
 ///
 /// Consult <https://en.wikipedia.org/wiki/Pascal%27s_triangle> for computation of binomial coefficients without integer overflow.
-pub(crate) fn chooses(n: u64) -> Vec<u64> {
+pub fn chooses(n: u64) -> Vec<u64> {
     todo!()
 }
 
@@ -49,7 +49,7 @@ pub(crate) fn chooses(n: u64) -> Vec<u64> {
 ///
 /// For instance, `zip(vec![1, 2, 3], vec![4, 5])` equals to `vec![(1, 4), (2, 5)]`.
 /// Here, `3` is ignored because it doesn't have a partner.
-pub(crate) fn zip(lhs: Vec<u64>, rhs: Vec<u64>) -> Vec<(u64, u64)> {
+pub fn zip(lhs: Vec<u64>, rhs: Vec<u64>) -> Vec<(u64, u64)> {
     todo!()
 }
 
@@ -131,13 +131,13 @@ const FIBONACCI_VEC: Vec2 = Vec2 { a: 1, b: 0 };
 /// Calculates the Fibonacci number. (We assume the absence of integer overflow.)
 ///
 /// Consult <https://web.media.mit.edu/~holbrow/post/calculating-fibonacci-numbers-with-matrices-and-linear-algebra/> for matrix computation of Fibonacci numbers.
-pub(crate) fn fibonacci(n: u64) -> u64 {
+pub fn fibonacci(n: u64) -> u64 {
     (FIBONACCI_MAT.power(n) * FIBONACCI_VEC).get_upper()
 }
 
 /// Writes down the lyrics of "twelve days of christmas".
 ///
 /// Hint: Google the song title for lyrics and look at the test code for the expected result.
-pub(crate) fn twelve_days_of_christmas_lyrics() -> String {
+pub fn twelve_days_of_christmas_lyrics() -> String {
     todo!()
 }
diff --git a/src/assignments/mod.rs b/src/assignments/mod.rs
index ce815f0..06c633a 100644
--- a/src/assignments/mod.rs
+++ b/src/assignments/mod.rs
@@ -1,7 +1,9 @@
+//! KAIST CS220 Assignments.
+
 #![allow(dead_code)]
 #![allow(unused_variables)]
 
-mod assignment01;
+pub mod assignment01;
 mod assignment01_grade;
-mod assignment02;
+pub mod assignment02;
 mod assignment02_grade;
diff --git a/src/lib.rs b/src/lib.rs
index 14c5653..d7a4948 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,4 +30,4 @@
 #![deny(unused_lifetimes)]
 #![deny(unstable_features)]
 
-mod assignments;
+pub mod assignments;