Question: Information:  - Mahaman Smaila ( born 28 February 1986 ) is an amateur boxer from Cameroon who competed in the 2008 Olympics at junior welterweight but lost his first bout to Cuban Roniel Iglesias .  - The 2012 Summer Olympics, formally the Games of the XXX Olympiad and commonly known as London 2012, was a major international multi-sport event celebrated in the tradition of the Olympic Games, as governed by the International Olympic Committee (IOC). It took place in London and to a lesser extent across the United Kingdom from 25 July to 12 August 2012. The first event, the group stage in women's football began on 25 July at the Millennium Stadium in Cardiff, followed by the opening ceremonies on 27 July. 10,768 athletes from 204 National Olympic Committees (NOCs) participated.  - Roniel Iglesias Sotolongo (born August 14, 1988) is a Cuban amateur boxer, best known for winning the junior world title at lightweight in 2006, a bronze medal at the 2008 Summer Olympics in Beijing and a gold at the 2012 Summer Olympics in London.  - The 2008 Summer Olympic Games, officially known as the Games of the XXIX Olympiad and commonly known as Beijing 2008, was a major international multi-sport event that took place in Beijing, China, from 8 to 24 August 2008. A total of 10,942 athletes from 204 National Olympic Committees (NOCs) competed in 28 sports and 302 events (a total of one event more than the schedule of the 2004 Games). China became the 22nd nation to host the Olympic Games and the 18th to hold a Summer Olympic Games. It was the third time that the Summer Olympic Games were held in East Asia and Asia, after Tokyo, Japan, in 1964 and Seoul, South Korea, in 1988.    Given the information, choose the subject and object entities that have the relation of 'participant of'.
Answer: mahaman smaila , 2008 summer olympics

Question: Information:  - The ophicleide is a keyed brass instrument similar to the tuba. It is a conical-bore keyed instrument belonging to the bugle family and has a similar shape to the sudrophone.  - Brass is a metal alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. It is a substitutional alloy: atoms of the two constituents may replace each other within the same crystal structure.  - The subcontrabass tuba is an extension of the tuba family within the modern contrabass tuba . At least five known examples have been created , all pitched in BBBb , sounding a full octave lower than standard BBb contrabass tubas . Music for them is written in bass clef sounding a full octave lower than notated .  - The tuba is the largest and lowest-pitched musical instrument in the brass family. Like all brass instruments, sound is produced by moving air past the lips, causing them to vibrate or "buzz" into a large cupped mouthpiece. It first appeared in the mid 19th-century, making it one of the newer instruments in the modern orchestra and concert band. The tuba largely replaced the ophicleide. "Tuba" is Latin for 'trumpet'.  - A trumpet is a musical instrument commonly used in classical and jazz ensembles. The trumpet group contains the instruments with the highest register in the brass family. Trumpet-like instruments have historically been used as signaling devices in battle or hunting, with examples dating back to at least 1500 BC; they began to be used as musical instruments only in the late-14th or early 15th century. Trumpets are used in art music styles, for instance in orchestras, concert bands, and jazz ensembles, as well as in popular music. They are played by blowing air through almost-closed lips (called the player's embouchure), producing a "buzzing" sound that starts a standing wave vibration in the air column inside the instrument. Since the late 15th century they have primarily been constructed of brass tubing, usually bent twice into a rounded rectangular shape.   - Latin (Latin: ) is a classical language belonging to the Italic branch of the Indo-European languages. The Latin alphabet is derived from the Etruscan and Greek alphabets.  - A concert band, also called wind ensemble, symphonic band, wind symphony, wind orchestra, wind band, symphonic winds, symphony band, or symphonic wind ensemble, is a performing ensemble consisting of members of the woodwind, brass, and percussion families of instruments, along with the double bass.  - An orchestra is a large instrumental ensemble typical of classical music, which features string instruments such as violin, viola, cello and double bass, as well as brass, woodwinds, and percussion instruments, grouped in sections. Other instruments such as the piano and celesta may sometimes appear in a fifth keyboard section or may stand alone, as may the concert harp and, for performances of some modern compositions, electronic instruments.    Given the information, choose the subject and object entities that have the relation of 'subclass of'.
Answer:
subcontrabass tuba , musical instrument