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