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