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