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