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