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