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