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