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