diff --git a/tetromino.py b/tetromino.py
index b17bfcd..a83edc8 100644
--- a/tetromino.py
+++ b/tetromino.py
@@ -25,7 +25,7 @@ class Tetromino():
     def ATetromino(): #ok
         return Tetromino(
             [
-                ['I', 'I', 'I']
+                ['A', 'A', 'A']
             ],
             'a'
         )
@@ -34,7 +34,7 @@ class Tetromino():
     def BTetromino(): #ok
         return Tetromino(
             [
-                ['I', 'I',]
+                ['B', 'B',]
             ],
             'b'
         )
@@ -43,7 +43,7 @@ class Tetromino():
     def CTetromino(): #ok
         return Tetromino(
             [
-                ['I']
+                ['C']
             ],
             'c'
         )
@@ -63,8 +63,8 @@ class Tetromino():
     def DTetromino(): #ok
         return Tetromino(
             [
-                ['O', 'O'],
-                [' ', 'O']
+                ['D', 'D'],
+                [' ', 'D']
             ],
             'd'
         )