diff --git a/pyjecteur/common.py b/pyjecteur/common.py
index 7db35fa..62b45b4 100644
--- a/pyjecteur/common.py
+++ b/pyjecteur/common.py
@@ -5,6 +5,9 @@ from enum import Enum
 
 LedBarLen = 16
 
+def elongate(colors: List[Color], factor: int) -> List[Color]:
+    return [[elt] * factor for elt in colors]
+
 def remove_duplicates(colors: List[Color]) -> Tuple[List[Color], List[int]]:
     if len(colors) == 0:
         return ([], [])
@@ -21,7 +24,7 @@ def remove_duplicates(colors: List[Color]) -> Tuple[List[Color], List[int]]:
 def reduplicate(colors: List[Color], repetitions: List[int]) -> List[Color]:
     """
     Re-duplicates a list. Takes in a list of elements and a list of numbers of
-    repetitions. Concatetantes the repeted elements.
+    repetitions. Concatenates the repeted elements.
 
     Requires both lists to have the same length
     """