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