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