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