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