- Dấu "+ ; -" dữ nguyên
- Dấu "x" ⇒ "*"
- Dấu ":" ⇒ "/"
- Phép nâng lũy thừa: ^
- Phép tính phần trăm: %
What does the doctor recommend to eat?
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What do happy people do?
What kind of food will help people to keep fit and stay healthy?
