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