diff --git a/merge-csv-lists.py b/merge-csv-lists.py
index c695552..2a53d55 100644
--- a/merge-csv-lists.py
+++ b/merge-csv-lists.py
@@ -2,13 +2,11 @@
 import argparse
 
 
-def unique_combined_list(input1, input2):
-    # Split each input by comma and trim whitespace
-    list1 = [item.strip().title() for item in input1.split(",")]
-    list2 = [item.strip().title() for item in input2.split(",")]
-
+def unique_combined_list(*inputs):
     # Combine lists
-    combined_list = list1 + list2
+    combined_list = [
+        item.strip().title() for input_list in inputs for item in input_list.split(",")
+    ]
 
     # Create an empty list to store the final unique names
     final_list = []
@@ -48,18 +46,21 @@ def unique_combined_list(input1, input2):
 def main():
     # Create an argument parser
     parser = argparse.ArgumentParser(
-        description="Combine two comma-separated lists into one unique sorted list."
+        description="Combine multiple comma-separated lists into one unique sorted list."
     )
 
-    # Add arguments for the two input lists
-    parser.add_argument("list1", type=str, help="The first comma-separated list.")
-    parser.add_argument("list2", type=str, help="The second comma-separated list.")
+    # Add a variable number of input lists
+    parser.add_argument("lists", nargs="+", type=str, help="Comma-separated lists.")
 
     # Parse the arguments
     args = parser.parse_args()
 
+    # If only one list is provided, use it twice
+    if len(args.lists) == 1:
+        args.lists.append(args.lists[0])
+
     # Get the unique combined list
-    result = unique_combined_list(args.list1, args.list2)
+    result = unique_combined_list(*args.lists)
 
     print(result)