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