diff --git a/util/notegrep/m.py b/util/notegrep/m.py
index 1361125..ff56c5e 100644
--- a/util/notegrep/m.py
+++ b/util/notegrep/m.py
@@ -18,6 +18,9 @@ class Multi():
         self.patterns = patterns
         self.files = files
 
+    def remove_duplicates(self):
+        self.patterns, self.files = list(dict.fromkeys(self.patterns)), list(dict.fromkeys(self.files))
+
     def print_matches(self):
         
         for file in self.files:
@@ -39,11 +42,13 @@ class Multi():
 def main():
     try:    
         newMulti = Multi(sys.argv[1].split(','), sys.argv[2].split(','))
+        newMulti.remove_duplicates()
         newMulti.print_matches()
     except IndexError:
         patterns = input("Enter patterns, separated by a comma: ")
         files = input("Enter files, separated by a comma: ")
         newMulti = Multi(patterns.split(','), files.split(','))
+        newMulti.remove_duplicates()
         newMulti.print_matches()