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