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