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