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