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