Step 1 (Remove):
Step 2 (Undo):
x =
Step 1 (Remove):
Step 2 (Undo):
x =
Step 1 (Remove):
Step 2 (Undo):
x =
Step 1 (Remove):
Step 2 (Undo):
x =
Step 1 (Remove):
Step 2 (Undo):
x =
Step 1 (Remove):
Step 2 (Undo):
x =
Step 1 (Remove):
Step 2 (Undo):
x =
Step 1 (Remove):
Step 2 (Undo):
x =
Step 1 (Remove):
Step 2 (Undo):
x =
Step 1 (Remove):
Step 2 (Undo):
x =