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