Text: Both hydrofoils and large, powerful catamarans will cut ferry journey times in half; however you will sit in an air-conditioned interior cabin for the duration of your ride.
Entailment: If you want to cut ferry journey times in half, you can use hydrofoils and catamarans, but you will sit in an air-conditioned interior cabin for the duration of your ride.
Contradiction: In both hydrofoils and large, powerful catamarans, you can sit outside during the duration of your ride.