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