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