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