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