1 files changed, 3 insertions, 0 deletions
diff --git a/utils/comb.js b/utils/comb.js
index f607790..dee97c1 100644
--- a/utils/comb.js
+++ b/utils/comb.js
@@ -10,3 +10,6 @@ function sub(char1, char2){
   if (char1 == char2) return '';
   else return char1;
 }
+
+exports.add = add;
+exports.sub = sub;