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 Yellow Blue Green
Blue Red Yellow Blue
Blue Yellow Red Blue
Green Blue Yellow Black

Output:
Yellow


Example 2
Input:
Black Yellow Red Blue
Blue Yellow Yellow Red
Red Yellow Yellow Blue
Blue Red Yellow Black

Output:
Yellow


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

Output:
Yellow


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


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