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