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