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