How would you group these four colors into two complementary colors?
Red, Blue, Green, Yellow
Complementary colors are opposite each other on the color wheel and create visual contrast when used together. Using a traditional color wheel, Red and Green are complementary colors, and Blue and Yellow are complementary colors. So, one way of grouping these four colors into two complementary pairs would be: 

- Red and Green
- Blue and Yellow
Complete the following task based on the instruction and optional input provided.### Instruction:
How would you group these four colors into two complementary colors?

### Input:
Red, Blue, Green, Yellow

### Output:
Complementary colors are opposite each other on the color wheel and create visual contrast when used together. Using a traditional color wheel, Red and Green are complementary colors, and Blue and Yellow are complementary colors. So, one way of grouping these four colors into two complementary pairs would be: 

- Red and Green
- Blue and Yellow