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Being qua being: the nature of the universe as a whole; objective reality; identity, causality; the nature of knowledge; consciousness, reason, logic, volition, the senses, etc.
Principles of human action: code of values, the virtues, etc.
The nature and purpose of art: judging art, sense of life response, techniques of creation, etc.
A proper social system: individual rights, the nature of government, etc.