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zelph - A Sophisticated Semantic Network System

German Empire

German Empire

Deductions

era is for example German Empire ⇐ (German Empire is a era), (is a is inverse of is for example)
German Empire is a era ⇐ (historical period is subclass of era), (German Empire is a historical period)
historical period is for example German Empire ⇐ (German Empire is a historical period), (is a is inverse of is for example)