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:
Brown Pink
Yellow Purple

Output:
Brown Pink Brown Pink
Yellow Purple Yellow Purple
Brown Pink Brown Pink
Yellow Purple Yellow Purple


Example 2
Input:
Black Red
Black Orange

Output:
Red Black Black Red
Orange Black Black Orange
Red Black Black Red
Orange Black Black Orange


Example 3
Input:
Black Red
Black Black

Output:
Red Black Black Red
Black Black Black Black
Red Black Red Black
Black Black Black Black


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

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