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