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