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

Output:
Yellow


Example 2
Input:
Blue Red Green Green
Green Green Green Blue
Green Green Green Blue
Blue Red Black Black

Output:
Yellow


Example 3
Input:
Blue Green Red Green
Blue Blue Red Black
Blue Blue Red Green
Blue Green Red Green

Output:
Yellow


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


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:

```
Yellow
```
assistant