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