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