Question: What re the materials used to make a submarine and what is its source of energy?
Paraphrase: What materials are used to build and what kind of energy is used in a submarine?
SPARQL (Wikidata): SELECT ?ans_1 ?ans_2 WHERE { wd:Q2811 wdt:P186 ?ans_1 . wd:Q2811 wdt:P618 ?ans_2 }
Answer: carbon steel, nuclear power, alloy steel, nuclear power, carbon steel, air-independent propulsion, alloy steel, air-independent propulsion, carbon steel, diesel-electric transmission, alloy steel, diesel-electric transmission