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