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