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