diff --git a/src/pp/merge_blank.rs b/src/pp/merge_blank.rs
index aad4242..fe0fdc5 100644
--- a/src/pp/merge_blank.rs
+++ b/src/pp/merge_blank.rs
@@ -46,8 +46,6 @@ pub fn pp_merge_blank(seq: &str) -> String {
 
 #[test]
 fn test_part1() {
-    use crate::pp::merge_blank::pp_merge_blank;
-
     let seq = "    \n    \r    \t    ";
     assert_eq!(pp_merge_blank(seq), " ");
 
diff --git a/src/pp/mod.rs b/src/pp/mod.rs
index 317d1f7..0e19551 100644
--- a/src/pp/mod.rs
+++ b/src/pp/mod.rs
@@ -1,10 +1,10 @@
-use crate::pp::comment::pp_comment;
-use crate::pp::merge_blank::pp_merge_blank;
-
-mod comment;
 mod merge_blank;
+mod rm_comment;
+
+pub use merge_blank::pp_merge_blank as merge_blank;
+pub use rm_comment::pp_rm_comment as rm_comment;
 
 pub fn preprocess(seq: &str) -> String {
-    let r = pp_comment(seq);
-    pp_merge_blank(&r)
+    let r = rm_comment(seq);
+    merge_blank(&r)
 }
diff --git a/src/pp/comment.rs b/src/pp/rm_comment.rs
similarity index 94%
rename from src/pp/comment.rs
rename to src/pp/rm_comment.rs
index 39973db..c6e2722 100644
--- a/src/pp/comment.rs
+++ b/src/pp/rm_comment.rs
@@ -1,8 +1,8 @@
 use crate::infra::either::Either;
 use crate::infra::iter::IteratorExt;
 use crate::infra::vec::VecExt;
-use crate::pp::comment::Either::*;
-use crate::pp::comment::Pat::*;
+use crate::pp::rm_comment::Either::*;
+use crate::pp::rm_comment::Pat::*;
 
 #[derive(Clone)]
 enum Pat {
@@ -53,7 +53,7 @@ fn go(
     go(reduced_stack, tail.as_str())
 }
 
-pub fn pp_comment(seq: &str) -> String {
+pub fn pp_rm_comment(seq: &str) -> String {
     let r = go(vec![], seq)
         .into_iter()
         .fold(vec![], |acc, p| match p {
@@ -74,7 +74,7 @@ pub fn pp_comment(seq: &str) -> String {
 
 #[test]
 fn test_part1() {
-    use crate::pp::comment::pp_comment;
+    use crate::pp::rm_comment;
     let seq = "match x with# Comment 123# Comment 123
 \
              | 1 -> if a then b else c\
@@ -123,12 +123,12 @@ fn test_part1() {
                        )\
                 | _ -> baz";
 
-    assert_eq!(pp_comment(seq), r);
+    assert_eq!(rm_comment(seq), r);
 }
 
 #[test]
 fn test_part2() {
-    use crate::pp::comment::pp_comment;
+    use crate::pp::rm_comment;
 
     let seq = "# Comment 123# Comment 123
 \
@@ -167,5 +167,5 @@ fn test_part2() {
              let m = (), n = 4 in \
              add () 456";
 
-    assert_eq!(pp_comment(seq), r);
+    assert_eq!(rm_comment(seq), r);
 }