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