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