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