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