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