Question: What brewer of Singha beer sponsors the Premiership Rugby Sevens Series?

Context paragraphs:
2017–18 World Rugby Sevens Series: The 2017–18 World Rugby Sevens Series, known for sponsorship reasons as the HSBC World Rugby Sevens Series, will be the 19th annual series of rugby sevens tournaments for national men's rugby sevens teams.  The Sevens Series has been run by World Rugby since 1999–2000.

Fiji national rugby sevens team: The Fiji national rugby sevens team is one of the most popular and successful rugby sevens teams in the world.  Fiji has won the Hong Kong Sevens a record seventeen times since its inception in 1976.  Fiji has also won the Rugby World Cup Sevens twice — in 1997 and 2005 (coincidentally, the two times it has been held in Hong Kong).  The South African national rugby sevens team is currently the reigning World Rugby Sevens Series Champions in World Rugby.  Fiji is also known for winning the gold medal at the 2016 Summer Olympics in Brazil, the country's first medal in any event.

Kenya national rugby sevens team: The Kenya national rugby sevens team competes in the World Rugby Sevens Series, Rugby World Cup Sevens and the Commonwealth Games.  They are currently one of the 15 "core teams" of the World Series, with a guaranteed place in all ten events each season.  Kenya recorded its first tournament win in the World Rugby Sevens Series after beating Fiji at the 2016 Singapore Sevens.

2016–17 World Rugby Sevens Series: The 2016–17 World Rugby Sevens Series, known for sponsorship reasons as the HSBC World Rugby Sevens Series, was the 18th annual series of rugby sevens tournaments for national rugby sevens teams.  The Sevens Series has been run by World Rugby since 1999–2000.  South Africa won the Series with a comfortable 28-point margin over England; South Africa won five of the ten tournaments.

2013 Premiership Rugby Sevens Series: The 2013 Premiership Rugby Sevens Series (styled for sponsorship reasons as the 2013 J.P Morgan Asset Management Premiership Rugby 7s Series) was the fourth Rugby Union 7-a-side competition for the twelve 2013–14 Aviva Premiership Clubs.  The group stages were run on 1–3 August 2013 and the final at the The Recreation Ground on 9 August 2013.

2015–16 World Rugby Women's Sevens Series: The 2015–16 World Rugby Women's Sevens Series was the fourth edition of the World Rugby Women's Sevens Series (formerly the IRB Women's Sevens World Series), an annual series of tournaments organised by World Rugby for women's national teams in rugby sevens.  The tour was a companion to the 2015–16 World Rugby Sevens Series for men.

World Rugby Sevens Series: The World Rugby Sevens Series, known officially as the HSBC World Rugby Sevens Series due to sponsorship from banking group HSBC, is an annual series of international rugby sevens tournaments run by World Rugby featuring national sevens teams.  The series, organised for the first time as the World Sevens Series in the 1999–2000 season, was formed to develop an elite-level competition series between rugby nations and develop the sevens game into a viable commercial product for World Rugby.

Singha: Singha (Thai: สิงห์ ; ) is a 5% abv pale lager produced by Boon Rawd Brewery.  It is available as a 5% abv draught beer; 3.5% abv Singha Light was introduced in 2006.

Premiership Rugby Sevens Series: The Premiership Rugby Sevens Series (known as the Singha Premiership Rugby 7s Series from 2015, though sponsorship from Singha) is a Rugby Sevens competition for the twelve Aviva Premiership clubs that will play the following season (i.e. the 2010 competition features the teams playing in the Aviva Premiership in the 2010–11 season).  It was started in 2010, as an off-season competition, held during the months of July and August.  Between 2014 and 2016 the competition included the four Welsh regions which compete in the Pro14.

2015–16 World Rugby Sevens Series: The 2015–16 World Rugby Sevens Series, known for sponsorship reasons as the HSBC World Rugby Sevens Series, was the 17th annual series of rugby union sevens tournaments for national men's rugby sevens teams.  The Sevens Series has been run by World Rugby since 1999–2000.  This season, the series expanded from nine to ten events.

Supporting paragraphs: Premiership Rugby Sevens Series Singha
Answer: Boon Rawd Brewery