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