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