Your goal is to find the secret four-color code. The following colors are possible: white, green, brown, blue, black, purple.
Some guesses have already been made. I will provide feedback for each guess made with which it is possible to unambigiously determine the secret code.

Previous Guesses:
Guess: ['green', 'purple', 'blue', 'brown']. Hint: three colors are in the secret code but in the wrong positions.
Guess: ['white', 'green', 'green', 'blue']. Hint: two colors are in the correct positions and one color is in the secret code but in the wrong positions.
Guess: ['white', 'blue', 'green', 'purple']. Hint: three colors are in the secret code but in the wrong positions.
A B C D
brown, green, white, blue black, black, black, white white, white, brown, black blue, blue, green, black