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