(=> (Sub-Plan ?Sub-Plan)
(Exists (?Plan) (Sub-Plan-Of ?Sub-Plan ?Plan)))
(<=> (Sub-Plan ?Sub-Plan)
(And (Plan ?Sub-Plan)
(Qua-Entity ?Sub-Plan)
(Exists (?Plan) (Sub-Plan-Of ?Sub-Plan ?Plan))))
(<=> (Strategic-Action ?Strategic-Action)
(And (Sub-Plan ?Strategic-Action)
(Exists (?Strategy)
(And (Strategy ?Strategy)
(Sub-Plan-Of ?Strategic-Action ?Strategy)))))