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tautology (in logic)
A tautology refers to a logical formula that is always true, no matter what values are substituted.
(geometry) sphericity
The sphericity of this object is very high.
(literally) know the other side and yourself, a hundred battles will not be perilous
This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.
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