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