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