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