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