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