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:
Gray Gray Blue Blue
Gray Gray Blue Blue
Green Green Red Red
Green Green Red Red

Output:
Gray Blue
Green Red


Example 2
Input:
Gray Gray Red Red
Gray Gray Red Red
Purple Purple Blue Blue
Purple Purple Blue Blue

Output:
Gray Red
Purple Blue


Example 3
Input:
Pink Pink Red Red
Pink Pink Red Red
Brown Brown Purple Purple
Brown Brown Purple Purple

Output:
Pink Red
Brown Purple


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