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