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