instruction: Your goal is to find the secret two-color code. The following colors are possible: green, yellow, purple, 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: ['green', 'black']. Hint: none of the guessed colors are present in the secret code.
  Guess: ['yellow', 'yellow']. Hint: one color is in the correct position.
  Guess: ['yellow', 'purple']. Hint: two colors are in the secret code but in the wrong positions.