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