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