Input: Read this: The capital and largest city is Lahore which was the historical capital of the wider Punjab region. Other important cities include Faisalabad, Rawalpindi, Gujranwala, Sargodha, Multan, Sialkot, Bahawalpur, Gujrat, Sheikhupura, Jhelum and Sahiwal. Undivided Punjab is home to six rivers, of which five flow through Pakistani Punjab. From west to east, these are: the Indus, Jhelum, Beas, Chenab, Ravi and Sutlej. Nearly 60% of Pakistan's population lives in the Punjab. It is the nation's only province that touches every other province; it also surrounds the federal enclave of the national capital city at Islamabad. In the acronym P-A-K-I-S-T-A-N, the P is for Punjab.
Question: What does the S in Pakistan stand for?

Output: unanswerable


Input: Read this: A national railway system that extends throughout the country and into Spain, is supported and administered by Comboios de Portugal. Rail transport of passengers and goods is derived using the 2,791 km (1,734 mi) of railway lines currently in service, of which 1,430 km (889 mi) are electrified and about 900 km (559 mi) allow train speeds greater than 120 km/h (75 mph). The railway network is managed by the REFER while the transport of passengers and goods are the responsibility of Comboios de Portugal (CP), both public companies. In 2006 the CP carried 133 million passengers and 9,750,000 t (9,600,000 long tons; 10,700,000 short tons) of goods.
Question: Into what country does Portugal's railway system expand?

Output: Spain


Input: Read this: Micronesian colonists gradually settled the Marshall Islands during the 2nd millennium BC, with inter-island navigation made possible using traditional stick charts. Islands in the archipelago were first explored by Europeans in the 1520s, with Spanish explorer Alonso de Salazar sighting an atoll in August 1526. Other expeditions by Spanish and English ships followed. The islands derive their name from British explorer John Marshall, who visited in 1788. The islands were historically known by the inhabitants as "jolet jen Anij" (Gifts from God).
Question: Which explorer first saw the Marshall Islands?

Output: Alonso de Salazar


Input: Read this: Strange matter is a particular form of quark matter, usually thought of as a liquid of up, down, and strange quarks. It is contrasted with nuclear matter, which is a liquid of neutrons and protons (which themselves are built out of up and down quarks), and with non-strange quark matter, which is a quark liquid that contains only up and down quarks. At high enough density, strange matter is expected to be color superconducting. Strange matter is hypothesized to occur in the core of neutron stars, or, more speculatively, as isolated droplets that may vary in size from femtometers (strangelets) to kilometers (quark stars).
Question: What has Strange matter been definitely proven to occur as?

Output:
unanswerable