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