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