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