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