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