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