Your goal is to find the secret four-color code. The following colors are possible: black, yellow, purple, blue, red, green.
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', 'red', 'blue', 'green']. 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: ['red', 'green', 'black', 'blue']. 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
black, yellow, red, yellow yellow, red, blue, yellow green, black, red, blue purple, red, purple, black