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