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