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 Black Green Green
Green Black Green Black
Green Green Red Black
Black Black Black Red

Output:
Gray Gray Gray Gray
Gray Gray Gray Gray
Gray Gray Gray Gray
Gray Gray Gray Gray


Example 2
Input:
Green Red Green Red
Red Green Red Green
Green Red Green Red
Red Green Red Green

Output:
Yellow Yellow Yellow Yellow
Yellow Yellow Yellow Yellow
Yellow Yellow Yellow Yellow
Yellow Yellow Yellow Yellow


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

Output:
Gray Gray Gray Gray
Gray Gray Gray Gray
Gray Gray Gray Gray
Gray Gray Gray Gray


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

```
Gray Gray Gray Gray
Gray Gray Gray Gray
Gray Gray Gray Gray
Gray Gray Gray Gray
```
assistant