Question: How many couples are involved in the dance which Dick Leger was known for calling?

Context paragraphs:
Quiz (horse): Quiz (1798–1826) was a British Thoroughbred racehorse and sire best known for winning the classic St Leger Stakes in 1801.  Quiz was a durable, top-class performer, winning at least once a year in racing career which lasted seven seasons from August 1801 until April 1807.  Apart from the St Leger he won many other important races including three Brocket Hall Gold Cups (beating the Derby winner Eleanor on the third occasion), two Oatlands Stakes at Newmarket Racecourse, a Great Subscription Purse at York, a King's Plate and the Jockey Club Plate (defeating the St Leger winner Cockfighter).  In all he won twenty-one times in thirty-six races for four different owners before being retired to stud, where he proved to be a successful sire of winners.

The Duchess (horse): The Duchess (1813–1836) was a British Thoroughbred racehorse and broodmare best known for winning the classic St Leger Stakes in 1816.  In a racing career which lasted from March 1815 until October 1819 she competed in thirty-three races and won nineteen times.  She was still unnamed when winning three races as a two-year-old in 1815, when she was one of the leading juveniles in the north of England.  In the following year she was named Duchess of Leven, which was shortened to The Duchess when she was sold to Sir Bellingham Graham.  She won seven of her nine races as a three-year-old, including the Gold Cup at Pontefract and the St Leger at Doncaster.  The Duchess remained in training for a further three seasons, winning five times in 1817, twice in 1818 and twice in 1819, beating many leading horses of the time including Blacklock, Doctor Syntax, Rhoda and Filho da Puta.  After her retirement from racing, The Duchess had some success as a broodmare.

Paulina (horse): Paulina (1804–1819) was a British Thoroughbred racehorse and broodmare best known for winning the classic St Leger Stakes in 1807.  In a racing career which lasted from August 1806 until October 1809 she won nine times from fourteen races, all of which took place in Yorkshire.  She was undefeated in three races as an unnamed two-year-old, before winning three of her four races in 1807 including the St Leger at Doncaster and a valuable produce sweepstakes at York.  She won once from two starts as a four-year-old before winning a Great Subscription Purse at York and a King's Plate at Richmond in 1809.  She had a long rivalry with another Yorkshire mare named Thomasina, winning three of their five meetings.  Paulina was retired to stud where she became the female-line ancestor of many important winners including Andover and Sir Tatton Sykes.

Bhola Rijal: Bhola Rijal is a consultant Gynaecologist, Obstetrician and litterateur of Nepal.  He has expertise in In-vitro fertilization which helps against fertilization.  Dr. Bhola Prasad Rijal is a preeminent Consultant Gynaecologist and Obstetrician in Nepal.  Born in Dharan, the eastern hub of the country, in July 1948, Dr. Rijal has pioneered In-vitro fertilization in Nepal a major treatment for infertility, thereby providing joy and hope for many couples.  He is also the initiator for legalizing abortion in Nepal.  Alongside his medical profession, Dr Rijal’s patriotism is reflected in his literatures and outstanding song writing ability, which has made him a renowned lyricists and singer in Nepal.

Square dance: A square dance is a dance for four couples (eight dancers) arranged in a square, with one couple on each side, facing the middle of the square.  Square dances were first documented in 16th-century England but were also quite common in France and throughout Europe.  They came to North America with the European settlers and have undergone considerable development there.  In some countries and regions, through preservation and repetition, square dances have attained the status of a folk dance.

Pewett: Pewett (1786 – after 1812) was a British Thoroughbred racehorse and broodmare best known for winning the classic St Leger Stakes in 1789.  Her name was spelled in various ways including Pewet, Pewit and Pewitt and would appear to be a reference to the northern lapwing.  In a racing career which lasted from May 1789 and May 1792 she won four of her thirteen races.  In the St Leger she finished second to a colt named Zanga, but was awarded the race when the winner was disqualified for causing interference.  After her retirement from racing she became a successful broodmare whose descendants won many important races throughout the nineteenth and twentieth centuries.

Surrogacy in New Zealand: Surrogacy is legal in New Zealand if it is performed altruistically, where the surrogate donates her services selflessly, without any compensation beyond the coverage of expenses.  Commercial surrogacy, where the surrogate is paid in addition to the coverage of expenses, is not legal.  There is a lack of specific legislation and regulations dealing with surrogacy, though the recent increase in surrogacy cases has led to a number of amendments.  New Zealand is party to the United Nations Convention on the Rights of the Child, and ratified it in April 1993.  The primary principle of this Convention is that the best interests of the child are paramount, which must then encompass all surrogacy agreements and regulations.  The lack of clear surrogacy legislation in New Zealand has led to many couples engaging in reproductive tourism in order to ensure the surrogacy is successful.  This has the potential to significantly impact the human rights of all of the parties involved.

Hethersett (horse): Hethersett (1959–1966) was a British Thoroughbred racehorse and sire best known for falling when favourite for the Epsom Derby and then winning the classic St Leger Stakes in 1962.  After showing promise as a two-year-old he was the highest-rated British three-year-old of 1962 when he also won the Brighton Derby Trial and the Great Voltigeur Stakes.  After his success in the Leger, when he gave his trainer Dick Hern his first classic win, Hethersett never won again and was retired in 1963.  He had a brief but successful stud career before his death at the age of seven.

Dick Leger: Richard 'Dick' Leger (April 18, 1925 – August 17, 1999) was an accomplished Square Dance Caller known as the 'Man with the Guitar'

Ronda (Tango): Ronda (Spanish ""la ronda"" for ""the ring"" or ""the round"") refers to the line of dance in Argentine Tango.  Similar to ballroom dancing the traditional ronda requires the dance couples to move counter clockwise around the room.  This enables many couples to share the floor in social dance situations.

Supporting paragraphs: Dick Leger Square dance
Answer: four