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