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