STEP 16: Now let's make everything scroll in the opposite direction when the player presses the Left Arrow key!

• Go to and drag Left Key into your program. Delete the default command.
• Inside the event, have the stage Move Right 20 pixels and have the goal Move Right 20 pixels.
• Go to and drag Loop through List inside the left_key event.
• For each kitten in kitten_list, have the kitten Move Right 20 Pixels.

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