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