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