If you want to say "Hello" to any anyone, then you can say by these different ways i.e.:
1. Hey there!
2. How are things with you?
3. What's new?
4. It's good to see you!
5. Look who it is!
6. What's up?
7. Long time!
8. How is it going?
9. How's life?
10. How do you do?
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