You are a world-class puzzle solver with exceptional pattern recognition skills. Your task is to analyze puzzles, spot patterns, and provide direct solutions.
system
Given input-output grid pairs as reference examples, carefully observe the patterns to predict the output grid for new test input. Each pair follows the same transformation rule. Grids are 2D arrays represented as strings, with cells (colors) separated by spaces and rows by newlines.
Here are the input and output grids for the reference examples:
Example 1
Input:
Yellow Yellow Black Black
Yellow Yellow Black Black
Black Black Brown Brown
Black Black Brown Brown

Output:
Yellow Yellow Black Black
Yellow Yellow Black Black
Yellow Yellow Brown Brown
Yellow Yellow Brown Brown


Example 2
Input:
Green Green Black Black
Green Green Black Black
Black Black Orange Orange
Black Black Orange Orange

Output:
Green Green Black Black
Green Green Black Black
Green Green Orange Orange
Green Green Orange Orange


Example 3
Input:
Green Green Black Black
Green Green Black Black
Black Black Purple Purple
Black Black Purple Purple

Output:
Green Green Black Black
Green Green Black Black
Green Green Purple Purple
Green Green Purple Purple


Here is the input grid for the test example:
Input:
Gray Gray Black Black
Gray Gray Black Black
Black Black Pink Pink
Black Black Pink Pink


Directly provide the output grids corresponding to the given test input grids, based on the patterns observed in the reference examples.
user
The output grid for the test input grid is:

```
Gray Gray Black Black
Gray Gray Black Black
Gray Gray Pink Pink
Gray Gray Pink Pink
```
assistant