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