Your goal is to find the secret four-color code. The following colors are possible: purple, green, black, white, brown, yellow.
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', 'brown', 'white', 'yellow']. Hint: two colors are in the secret code but in the wrong positions.
Guess: ['purple', 'purple', 'green', 'brown']. Hint: three colors are in the secret code but in the wrong positions.
Guess: ['black', 'green', 'brown', 'purple']. 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, white, yellow, yellow brown, green, black, purple black, brown, black, black black, black, yellow, brown