With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: South Korea's main language was invented in 1444.
text_B: The Korean alphabet , known as Hangul in South Korea -LRB- also transcribed Hangeul -RRB- and as Choson ` gul  /  Choson Muntcha in North Korea is the alphabet that has been used to write the Korean language since the 15th century .. Korean. Korean language. South Korea. South Korea. North Korea. North Korea. alphabet. alphabet. Korean language. Korean language. It was created in 1443 under King Sejong the Great during the Joseon Dynasty .. Sejong the Great. Sejong the Great. King Sejong the Great. Sejong the Great. Joseon Dynasty. Joseon. Now , the alphabet is the official script of both South Korea and North Korea , and co-official in the Yanbian Korean Autonomous Prefecture and Changbai Korean Autonomous County of China 's Jilin Province .. Korean. Korean language. South Korea. South Korea. North Korea. North Korea. alphabet. alphabet. script. writing system. Yanbian Korean Autonomous Prefecture. Yanbian Korean Autonomous Prefecture. Changbai Korean Autonomous County. Changbai Korean Autonomous County. Jilin Province. Jilin. In South Korea , Hangul is used primarily to write the Korean language , as using Hanja -LRB- Chinese characters -RRB- in typical Korean writing had fallen out of common usage during the late 1990s .. Korean. Korean language. South Korea. South Korea. Korean language. Korean language. Hanja. Hanja. Chinese characters. Chinese characters. In its classical and modern forms , the alphabet has 19 consonant and 21 vowel letters .. alphabet. alphabet. consonant. consonant. vowel. vowel. However , instead of being written sequentially like the letters of the Latin alphabet , Hangul letters are grouped into blocks , such as han , each of which transcribes a syllable .. alphabet. alphabet. syllable. syllable. That is , although the syllable han may look like a single character , it is actually composed of three letters  : h , a , and n. Each syllabic block consists of two to six letters , including at least one consonant and one vowel .. syllable. syllable. consonant. consonant. vowel. vowel. These blocks are then arranged horizontally from left to right or vertically from top to bottom .. Each Korean word consists of one or more syllables , hence one or more blocks .. Korean. Korean language. The number of mathematically possible distinct blocks is 11,172 , though there are far fewer possible syllables allowed by Korean phonotactics , and not all phonotactically possible syllables occur in actual Korean words .. Korean. Korean language. phonotactics. phonotactics. Of the 11,172 possible Hangul syllables , the most frequent 256 have a cumulative frequency of 88.2 % ; with the top 512 , it reaches 99.9 % .
related.