Your goal is to find the secret four-color code. The following colors are possible: purple, black, white, blue, brown, red.
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: ['blue', 'purple', 'red', 'white']. Hint: two colors are in the correct positions.
Guess: ['purple', 'purple', 'black', 'red']. Hint: two colors are in the correct positions.
Guess: ['purple', 'black', 'white', 'black']. Hint: three colors are in the secret code but in the wrong positions.
Guess: ['white', 'purple', 'black', 'white']. Hint: three colors are in the correct positions.
A B C D
purple, blue, red, brown brown, white, blue, purple brown, purple, black, white blue, blue, white, brown