• Add a While Loop to your program. Delete the two default commands inside the while loop.
• Change the variable above the loop to code. Change the value to an empty list with two square [ ] brackets.
• Have the loop run while the len() (length) of code is less than < 4.
• Drag Random Choice inside the loop. Name it next_col and change the list parameter to colors.

• if next_col is not in the code list, Append the value of next_col to the list code.
• Outside of the loop, add a Wait command so the stage pauses for 1 second.

To navigate the page using the TAB key, first press ESC to exit the code editor.