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