user: What is the Couple's Retreat Garden?

assistant: <think>
Couple's Retreat Garden (Chinese: 耦园; pinyin: Ǒu Yuán; Suzhou Wu: Ngeu yoe, Wu Chinese: [ŋøʏ ɦyø]) located in Suzhou city, Jiangsu province, China is a famous classical Chinese garden. It is recognized with other classical Suzhou gardens as a UNESCO World Heritage Site.</think>
The original garden was built by Lu Jin, prefect of Baoning district, in 1874. It was purchased by Shen Bingcheng, the magistrate of Susong. who rebuilt it in its current form. He also changed the name to the Couple's Garden Retreat. This name refers to the garden's two parts and alludes to a couple. It is recognized with other classical Suzhou gardens as a UNESCO World Heritage Site.

The 0.33 ha garden is divided into an east and west section by the residential core in the middle; an unusual composition for a classical garden. The eccentric design is continued in the form and details of many of the garden buildings, especially the Taoism Tower. The garden is located in the intersection of canals and is surrounded by water on three sides. It is accessible directly from the canal by boat. The West garden is composed of several structures grouped around a small grotto and a Library annex. It is structurally joined to the central residence. East Garden is the main garden of the complex. It consists of a grotto and pond ringed by a covered walkway that connects the structures. A smaller fruit orchard annex is attached.

user: What does Thai Songkran festival represents and how many days does it last?

assistant: <think>
Songkran is a term derived from Sanskrit संक्रान्ति saṅkrānti meaning 'to move' or 'movement'. It derives from the movement of the sun from one position to another in the zodiac. According to its literal meaning in Sanskrit, a Songkran occurs every month. However, the period that Thai people refer to as Songkran happens when the sun moves from Pisces to Aries in the zodiac. The correct name for this period should actually be Maha Songkran ('great Songkran) because it coincides with the arrival of a New Year. The Songkran festival is, therefore, a celebration of the New Year in accordance with the solar calendar. The celebration covers a period of three days: 13 April is regarded as Maha Songkran, the day that the sun moves into Aries on the zodiac or the last day of the old year. The next day, 14 April is called Wan Nao, the transitional day between the old and the new years, and 15 April is called Wan Thaloeng Sok (Thai: วันเถลิงศก 'to begin a new era or year'), New Year's day itself.</think>
Thai Songkran festival is a New Year celebration in Thailand according to solar calendar. Songkran happens when the sun moves from Pisces to Aries in the zodiac. The festival covers three days period from 13 April to 15 April.

user: Given the lineage of this historical military aircraft, when was the Avro Arrow first flown and what were the operating characteristics of that flight?

assistant: <think>
The Avro Canada CF-105 Arrow was a delta-winged interceptor aircraft designed and built by Avro Canada. The CF-105 held the promise of Mach 2 speeds at altitudes exceeding 50,000 feet (15,000 m) and was intended to serve as the Royal Canadian Air Force's (RCAF) primary interceptor into the 1960s and beyond.

The Arrow was the culmination of a series of design studies begun in 1953 that examined improved versions of the Avro Canada CF-100 Canuck. After considerable study, the RCAF selected a dramatically more powerful design, and serious development began in March 1955. The aircraft was intended to be built directly from the production line, skipping the traditional hand-built prototype phase. The first Arrow Mk. 1, RL-201, was rolled out to the public on 4 October 1957, the same day as the launch of Sputnik I.

Flight testing began with RL-201 on 25 March 1958, and the design quickly demonstrated excellent handling and overall performance, reaching Mach 1.9 in level flight. Powered by the Pratt & Whitney J75, another four Mk. 1s were completed, RL-202, RL-203, RL-204 and RL-205. The lighter and more powerful Orenda Iroquois engine was soon ready for testing, and the first Mk 2 with the Iroquois, RL-206, was ready for taxi testing in preparation for flight and acceptance tests by RCAF pilots by early 1959.</think>
The Avro Canada RL-201 Arrow was first flown in a test flight on March 25, 1958. During that flight, handling and performance proved excellent and the aircraft reached speeds of up to Mach 1.9 in level flight.