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