Information:  - Palawan (Pron. , from ), officially the Province of Palawan , is an archipelagic province of the Philippines that is located in the Mimaropa region. It is the largest province in the country in terms of total area of jurisdiction. Its capital is the City of Puerto Princesa, but it is governed independently from the province as a highly urbanized city.  - Oceania (or ), also known as Oceanica, is a region centred on the islands of the tropical Pacific Ocean. Opinions of what constitutes Oceania range from its three subregions of Melanesia, Micronesia, and Polynesia to, more broadly, the entire insular region between Southeast Asia and the Americas, including Australasia and the Malay Archipelago.  - Sulawesi, formerly known as Celebes (or ), is an island in Indonesia. One of the four Greater Sunda Islands, and the world's eleventh-largest island, it is situated between Borneo and the Maluku Islands. Within Indonesia, only Sumatra, Borneo and Papua are larger in territory, and only Java and Sumatra have larger populations.  - The Philippines, officially the Republic of the Philippines, is a sovereign island country in Southeast Asia situated in the western Pacific Ocean. It consists of about 7,641 islands that are categorized broadly under three main geographical divisions from north to south: Luzon, Visayas, and Mindanao. The capital city of the Philippines is Manila and the most populous city is Quezon City, both part of Metro Manila. Bounded by the South China Sea on the west, the Philippine Sea on the east and the Celebes Sea on the southwest, the Philippines shares maritime borders with Taiwan to the north, Vietnam to the west, Palau to the east and Malaysia and Indonesia to the south.  - Panay is a triangular island in the Philippines located in the western part of the Visayas. It is about across, ranking the sixth largest of the islands in the country. Politically, it is divided into four provinces: Aklan, Antique, Capiz, and Iloilo, all in the Western Visayas Region. It is located southeast of the island of Mindoro and northwest of Negros, separated by the Guimaras Strait. Between Negros and Panay Island lie the island-province of Guimaras. To the north and northeast is the Sibuyan Sea and the islands of Romblon; to the west and southwest is the Sulu Sea and to the south is Panay Gulf.  - Mindoro is the seventh-largest island in the Philippines. It is located off the coast of Luzon, and northeast of Palawan. The southern coast of Mindoro forms the northeastern extremum of the Sulu Sea.  - Sarawak is one of the two Malaysian states on the island of Borneo (Sabah being the other state). This territory has a certain level of autonomy in administration, immigration, and judiciary. Sarawak is in northwest Borneo, bordering the state of Sabah to the northeast, Kalimantan, the Indonesian portion of Borneo, to the south, and the independent state of Brunei in the northwest. The capital city, Kuching, is the economic centre of the state and the seat of the Sarawak state government. Other cities and towns in Sarawak include Miri, Sibu, and Bintulu. As of the 2015 census in Malaysia, the total population of Sarawak is 2,636,000. Sarawak has an equatorial climate with tropical rainforests and abundant animal and plant species. It has several prominent cave systems at Gunung Mulu National Park. Rajang River is the longest river in Malaysia; Bakun Dam, one of the largest dams in Southeast Asia, is located on one of its tributaries, the Balui River. Mount Murud is the highest point in Sarawak.  - The Sama-Bajau refers to several Austronesian ethnic groups of Maritime Southeast Asia with their origins from the southern Philippines. The name collectively refers to related people who usually call themselves the Sama or Samah; or are known by the exonyms Bajau (also spelled Badjao, Bajaw, Badjau, Badjaw, Bajo or Bayao) and Samal or Siyamal (the latter being considered offensive). They usually live a seaborne lifestyle, and use small wooden sailing vessels such as the "perahu" ("layag" in Meranau), "djenging", "balutu", "lepa", "pilang", and "vinta" (or "lepa-lepa"). Some Sama-Bajau groups native to Sabah are also known for their traditional horse culture.  - Southeast Asia or Southeastern Asia is a subregion of Asia, consisting of the countries that are geographically south of China, east of India, west of New Guinea and north of Australia. The region lies near the intersection of geological plates, with heavy seismic and volcanic activity. Southeast Asia consists of two geographic regions:  - A slit drum is a hollow percussion instrument. In spite of the name, it is not a true drum but an idiophone, usually carved or constructed from bamboo or wood into a box with one or more slits in the top. Most slit drums have one slit, though two and three slits (cut into the shape of an "H") occur. If the resultant tongues are different width or thicknesses, the drum will produce two different pitches. It is used throughout Africa, Southeast Asia, and Oceania. In Africa such drums, strategically situated for optimal acoustic transmission (e.g., along a river or valley), have been used for long-distance communication.  - The Agung a Tamlang is a type of Philippine slit drum made of hollowed out bamboo in imitation of the real agung . Pitch is determined by the length and depth of the slit . The agung a tamlang is used as practice for the real agung : players either use either one agung a tamlang ( hold it with one hand and using the other to strike it with a beater ) or using two agung a tamlangs where the other agung is held with one 's feet .  - The agung is a set of two wide-rimmed, vertically suspended gongs used by the Maguindanao, Maranao, Sama-Bajau and Tausug people of the Philippines as a supportive instrument in kulintang ensembles. The agung is also ubiquitous among other groups found in Palawan, Panay, Mindoro, Mindanao, Sabah, Sulawesi, Sarawak and Kalimantan as an integral part of the agung orchestra.  - Kalimantan is the Indonesian portion of the island of Borneo. It comprises 73% of the island's area. The non-Indonesian parts of Borneo are Brunei and East Malaysia.  - The drum is a member of the percussion group of musical instruments. In the Hornbostel-Sachs classification system, it is a membranophone. Drums consist of at least one membrane, called a drumhead or drum skin, that is stretched over a shell and struck, either directly with the player's hands, or with a drum stick, to produce sound. There is usually a "resonance head" on the underside of the drum, typically tuned to a slightly lower pitch than the top drumhead. Other techniques have been used to cause drums to make sound, such as the thumb roll. Drums are the world's oldest and most ubiquitous musical instruments, and the basic design has remained virtually unchanged for thousands of years.  - Mindanao is the second largest and southernmost major island in the Philippines. It is also the name of one of the three island groups in the country (the other two being Luzon and the Visayas), consisting of the island of Mindanao and smaller outlying islands. Davao City is the largest city in Mindanao. As of the 2010 census, the island's population itself is 20,281,545 people, while the Mindanao island group has 21,968,174 inhabitants. Davao City is the most populous in Mindanao as 1,632,991 population, and the 2nd is Zamboanga City as 861,799 population, the 3rd is Cagayan de Oro City as 675,950 population, and followed by General Santos City as 594,446 population as of 2015 census.  - Sabah, nicknamed "Negeri Di Bawah Bayu" ("Land Below the Wind"), is one of the two Malaysian states on the island of Borneo (Sarawak being the other state). This territory has a certain level of autonomy in administration, immigration, and judiciary which differentiates it from the Malaysian Peninsula states. Sabah is situated in northern Borneo, bordering the state of Sarawak to the southwest, Kalimantan to the south, while separated by sea from the Federal Territory of Labuan in the west and the Philippines to the north and east. Kota Kinabalu is the capital city as well the economic centre for the state and the seat for the Sabah state government. Other major towns in Sabah include Sandakan and Tawau. As of the 2015 census in Malaysia, the state's population is 3,543,500. Sabah has an equatorial climate with tropical rainforests and abundant animal and plant species. The state has a long mountain ranges in the west side which formed as part of the Crocker Range National Park. Kinabatangan River is the second longest river in Malaysia while Mount Kinabalu is the highest point of Sabah as well for Malaysia.  - A gong (from Javanese, Indonesian, Malay: "gong"; Chinese: ; pinyin: luó) is an African, East and South East Asian musical percussion instrument that takes the form of a flat, circular metal disc which is hit with a mallet. It originated in China and later spread to Southeast Asia, and it can also be used in the percussion section of Western symphony orchestra.  - Africa is the world's second-largest and second-most-populous continent. At about 30.3 million km² (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area and 20.4 % of its total land area. With 1.1 billion people as of 2013, it accounts for about 15% of the world's human population. The continent is surrounded by the Mediterranean Sea to the north, both the Suez Canal and the Red Sea along the Sinai Peninsula to the northeast, the Indian Ocean to the southeast, and the Atlantic Ocean to the west. The continent includes Madagascar and various archipelagos. It contains 54 fully recognized sovereign states (countries), nine territories and two "de facto" independent states with limited or no recognition.  - A percussion instrument is a musical instrument that is sounded by being struck or scraped by a beater (including attached or enclosed beaters or rattles); struck, scraped or rubbed by hand; or struck against another similar instrument. The percussion family is believed to include the oldest musical instruments, following the human voice.    Given the paragraphs above, decide what entity has the relation 'subclass of' with 'idiophone'.
Answer:
agung a tamlang