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