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