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No.1 smile
No.2 cheeriness
No.3 assurance

I think the important skill to be successful in the world that is smile.
Because smile can make people happy, convivially.

Smile can give people a good image and they will think you are a good scout.
If you are a girl and you know how to smile, you will ask for anything.

And when you confront a big trouble, you can give smile to yourself.

Smile each means civility, benevolence, peace. So people like smile, so do I .