user: Extract the ways to spell "Muscovy duck" using the sample as a reference, and place them in a list.

assistant: <think>
The Muscovy duck has been domesticated for centuries, and is widely traded as "Barbary duck". Muscovy breeds are popular because they have stronger-tasting meat — sometimes compared to roasted beef — than that of the domestic duck. The meat is lean when compared to the fatty meat of mallard-derived ducks, its leanness and tenderness being often compared to veal. Muscovy ducks are also less noisy, and sometimes marketed as a "quackless" duck; even though they are not completely silent, they do not actually quack (except in cases of extreme stress). The carcass of a Muscovy duck is also much heavier than most other domestic ducks, which makes it ideal for the dinner table.</think>
- Muscovy duck
- Barbary duck
- Quackless duck

user: Given a reference text about Lee Kuan Yew, tell me when they were born, when they were president, and what their most famous accomplishment was in office.

assistant: <think>
Lee was born at home on 16 September 1923, the first child to Lee Chin Koon, a Semarang born Singaporean, and Chua Jim Neo, at 92 Kampong Java Road in Singapore, then part of the British Empire. Both of Lee's parents were English-educated third-generation Straits Chinese, with his paternal side being of Hakka descent from Dabu County. He was named 'Kuan Yew', meaning 'light and brightness', alternately meaning 'bringing great glory to one's ancestors'. Lee's paternal grandfather Lee Hoon Leong, who was described as "especially westernised", had worked on British ships as a purser, and hence gave Lee the Western name 'Harry'

As prime minister from 1959 to 1990, Lee presided over many of Singapore's advancements. He oversaw Singapore's transformation from an island nation with a high illiteracy rate and no natural resources into a developed country with a high-income economy within a single generation, commonly termed (from his autobiography) as 'From the third world to the first world'. Singapore's gross national product per capita (GNP) rose from $1,240 in 1959 to $18,437 in 1990. The unemployment rate in Singapore dropped from 13.5% in 1959 to 1.7% in 1990. External trade increased from $7.3 billion in 1959 to $205 billion in 1990. In other areas, the life expectancy at birth for Singaporeans rose from 65 years at 1960 to 74 years in 1990. The population of Singapore increased from 1.6 million in 1959 to 3 million in 1990. The number of public flats in Singapore rose from 22,975 in 1959 (then under the Singapore Improvement Trust) to 667,575 in 1990. The Singaporean literacy rate increased from 52% in 1957 to 90% in 1990. Telephone lines per 100 Singaporeans increased from 3 in 1960 to 38 in 1990. Visitor arrivals to Singapore rose from 100,000 in 1960 to 5.3 million in 1990.</think>
Lee Kuan Yew was born on 16 September 1923. 
He served as the inaugural Prime Minister of Singapore from 1959 to 1990.
His most famous accomplishment in office was overseeing Singapore's transformation from an island nation with a high illiteracy rate and no natural resources into a developed country with a high-income economy within a single generation, commonly termed (from his autobiography) as 'From the third world to the first world.

user: How do cardiac pacemakers work?

assistant: <think>
Modern pacemakers usually have multiple functions. The most basic form monitors the heart's native electrical rhythm. When the pacemaker wire or "lead" does not detect heart electrical activity in the chamber – atrium or ventricle – within a normal beat-to-beat time period – most commonly one second – it will stimulate either the atrium or the ventricle with a short low voltage pulse. If it does sense electrical activity, it will hold off stimulating. This sensing and stimulating activity continues on a beat by beat basis and is called "demand pacing". In the case of a dual-chamber device, when the upper chambers have a spontaneous or stimulated activation, the device starts a countdown to ensure that in an acceptable – and programmable – interval, there is an activation of the ventricle, otherwise again an impulse will be delivered.</think>
Pacemakers or cardiac pacemakers usually refer to artificial cardiac pacemakers, since our body has a natural cardiac pacemaker. 

The artificial cardiac pacemakers work by detecting electric signals through the conductive leads that are attached to the inside of heart walls, usually in atriums, and, in the absence of an electrical signal, generate one to stimulate the desired heart area, either an atrium or a ventricle.