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