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