Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

Example Input: Paragraph- Sent 1: When Alexander destroyed Tyre, most of the towns on the route to Egypt quickly capitulated.
Sent 2: A later tradition recorded his entry into Jerusalem: according to Josephus, Alexander was shown the Book of Daniel's prophecy, presumably chapter 8, which described a mighty Greek king who would conquer the Persian Empire.
Sent 3: He spared Jerusalem and pushed south into Egypt.
Sent 4: However, Alexander met with resistance at Gaza.
Sent 5: The stronghold was heavily fortified and built on a hill, requiring a siege.
Sent 6: When "his engineers pointed out to him that because of the height of the mound it would be impossible... this encouraged Alexander all the more to make the attempt".
Sent 7: After three unsuccessful assaults, the stronghold fell, but not before Alexander had received a serious shoulder wound.
Sent 8: As in Tyre, men of military age were put to the sword and the women and children were sold into slavery.
Sent 9: Alexander advanced on Egypt in later 332 BC, where he was regarded as a liberator.
Sent 10: He was pronounced son of the deity Amun at the Oracle of Siwa Oasis in the Libyan desert.
Sent 11: Henceforth, Alexander often referred to Zeus-Ammon as his true father, and after his death, currency depicted him adorned with rams horn as a symbol of his divinity.
Sent 12: During his stay in Egypt, he founded Alexandria-by-Egypt, which would become the prosperous capital of the Ptolemaic Kingdom after his death. 
Question: What was Alexander regarding as when he invaded Egypt?.
Example Output: A Liberator.

Example Input: Paragraph- Sent 1: The French have always wanted to know what it means to be a French­man.
Sent 2: Their history has been a constant quest for national identity: a conflict between strong regional loyalties and central authority.
Sent 3: In about 2000 b.c.
Sent 4: Celtic tribes — probably from eastern Europe — came looking for greener pastures in the areas that are now Franche-Comté, Alsace, and Bur­gundy.
Sent 5: At the same time, migrants from the Mediterranean countries were trickling into the south.
Sent 6: The first recorded settlement was the trading post set up by Phocaean Greeks from Asia Minor at Massalia (Mar­seilles) around 600 b.c.
Sent 7: , followed by other ports at Hyères, Antibes, and Nice.
Sent 8: But the Greeks developed few contacts with the interior beyond a little commerce in olives and wine with the Celts of Burgundy.
Sent 9: When their position was threatened by Ligurian pirates at sea and warlike tribes from inland, the merchants of Marseilles called on Rome for help.
Sent 10: From Gaul to France In 125 b.c.
Sent 11: , the Romans came in force, conquered the "Gallic barbarians," and set up a fortress at Aquae Sextiae (Aix-en-Provence).
Sent 12: They took advantage of this new stronghold to create Provincia (now Provence), stretching from the Alps to the Pyrénées, in order to guarantee communications between Italy and Spain.
Sent 13: When this province was endangered by fresh attacks from the north, Julius Caesar himself took charge, conquering practically the whole of Gaul by 50 b.c.
Sent 14: Caesar drew Gaul's northeastern frontier at the Rhine, taking in present-day Belgium, and warned that the Ger­man­ic tribes across the river — the Franks (after whom France is named), Alamans, and Saxons — would always threaten the security of the frontier.
Sent 15: The Romanization of Gaul sent the most energetic warriors to defend the outposts of the empire while their families settled down to work the land or build towns such as Lyon, Orange, Arles, and Nîmes, and the first great highways between them.
Sent 16: At the same time, merchants built up a thriving trade with the rest of the Roman Empire.
Sent 17: The pattern for the peasantry and bourgeoisie of France was thus established.
Sent 18: Christianity was introduced into Gaul in the first century a.d. 
Question: About what year, did Celtic tribes came looking for greener pastures in the areas that are now Franche-Comté, Alsace, and Bur­gundy?.
Example Output: 2000 B.C.

Example Input: Paragraph- Sent 1: The Golden Heian Era: The geomancers in 794 decided that Heian-kyo (modern Kyoto) would be an auspicious site for the imperial family.
Sent 2: It was indeed — until 1869.
Sent 3: Grants of tax-free land over the years had been made to Buddhist temples and members of the court aristocracy.
Sent 4: The most powerful families thus carved out for themselves whole regions that were to become the fiefdoms of Japanese feudalism.
Sent 5: By the end of the eighth century the clans had created a hierarchy of shiki, or rights, from the highest to the lowest ranks of society.
Sent 6: The aristocrat or court patron lent his prestige to a powerful provincial proprietor, who employed a competent estate-manager to oversee smallholders, who in turn worked their farms with dependent laborers.
Sent 7: This elaborate structure of interdependent rights and obligations was to serve Japanese society right into the 20th century.
Sent 8: Meanwhile, Heian court life blossomed in an effusion of aesthetic expression.
Sent 9: Princes and princesses judged the merits of birds, insects, flowers, roots, or seashells.
Sent 10: Literary party games held in ornate palace gardens required each guest to compose a small poem as his wine cup floated toward him along a miniature winding channel of water.
Sent 11: Expeditions were organized to the best viewing points for the first spring cherry blossoms, and special pavilions were built to watch the rising of the full moon.
Sent 12: Every gesture, from the most banal opening of an umbrella to the sublimest act of lovemaking, had its appropriate ceremonial.
Sent 13: Conversation often took the form of elegant exchanges of improvised verse.
Sent 14: The changing role of Chinese culture in Japanese life was epitomized in the language itself.
Sent 15: In the absence of an indigenous alphabet, Japanese scholars had with the greatest difficulty tried to adapt the complex ideograms of monosyllabic Chinese to the essentially polysyllabic Japanese.
Sent 16: Thus developed the katakana system used as a vehicle for writing Buddhist names and concepts.
Sent 17: After rival Fujiwara factions had been struggling for years to gain control of the imperial throne, they turned to the Taira and Minamoto armies in 1156 to wage the four-year war that heralded the end of the golden age of the Heian court.
Sent 18: The Taira, controlling the region along the Inland Sea, defeated the Minamoto armies based in the Kanto province east of the capital. 
Question: What led to the development of the katakana system?.
Example Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A need to adapt the complex ideograms of Chinese.

