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