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:
Black Blue Green Black
Green Yellow Yellow Blue
Blue Yellow Yellow Green
Black Green Blue Black

Output:
Yellow


Example 2
Input:
Yellow Yellow Yellow Yellow
Red Red Red Red
Red Red Red Red
Yellow Yellow Yellow Yellow

Output:
Green


Example 3
Input:
Black Black Yellow Green
Green Green Yellow Green
Red Red Green Green
Red Red Black Black

Output:
Green


Here is the input grid for the test example:
Input:
Yellow Blue Blue Yellow
Green Red Red Green
Green Red Red Green
Green Black Black Green


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:

```
Green
```
assistant