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