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