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