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