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