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