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