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