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