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