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