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