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