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