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