theorem ComplexSentence.instSoldierAtToParent
theorem ComplexSentence.instSoldierAtToParent: ∀ (x t : Type) [Soldier.At x t], Person.At x t
theorem ComplexSentence.instSoldierAtToParent
theorem ComplexSentence.instSoldierAtToParent: ∀ (x t : Type) [Soldier.At x t], Person.At x t