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