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