obelisk
Deductions
- obelisk has quality stability property ⇐ (structural stability is a stability property), (obelisk has quality structural stability)
- obelisk has quality structural stability ⇐ (obelisk is subclass of architectural structure), (architectural structure has quality structural stability)
- obelisk is for example Washington Monument ⇐ (Washington Monument is a obelisk), (is a is inverse of is for example)