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