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