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