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