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