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