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