1. Loyalty: is the footstone of life.

2. Of course, it is necessary and a footstone for truth - seeking of the extensional logic.

3. As we know, the encryption is the footstone of authentication and integrity control, so we introduce the principle of choosing encryption algorithms.

4. Economic liberalism and utilitarinism have become a theoretic footstone of precent day capitalist economy and politics.

5. Markowitz portfolio theory has become the footstone of modem finance theory.

6. Trust, is the footstone of cooperation's successful, and communication let they know each other better.

7. On the other hand, trust mechanism is the footstone of operating virtual enterprise successfully.

8. Consumption theory is the footstone of Keynes macro-economics , and it.

9. The theory of surplus value is the footstone of Marxist theory of economics.

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10. Educational equality is the basic of social equality and the footstone of construction harmonious society.

11. Preserving free speech was a guidance of founding country and the footstone of democratic politics.

12. Accounting as the basis of economic management is the footstone of socialism market economy.

13. Interaction is a new - fashioned network defense strategy, interaction model is footstone of intrusion protection system.

14. Quality is the basis of trust and sincerity, and the footstone of eternality.

15. All the countries in the world abide by the principle of privity of contract strictly as a footstone of the theory of contract.