Premise: The best way to approach this proud old town perched high on the cliffs is by boat, past the limpid blue waters of the Sdragonato cave and the Escalier du Roi d'Aragon, a staircase cut diagonally into the cliff face, used by the soldiers of the Spanish king in an abortive siege of the town in the 15th century.

Hypothesis: You can reach the town by boat and climb a staircase cut into the face of the cliff.
Relation: entailment