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