TASK DEFINITION: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
PROBLEM: SEHK , is a stock exchange located in Hong Kong .

SOLUTION: The Stock Exchange of Hong Kong ( SEHK , also known as Hong Kong Stock Exchange ) is a stock exchange based in Hong Kong .

PROBLEM: An abelian group is a set , " A " , together with an operation " • " .

SOLUTION: An abelian group is a set , " A " , together with an operation • that combines any two elements " a " and " b " to form another element denoted " a " • " b " .

PROBLEM: Moldova first took part at the Olympic Games as an independent nation in 1994 .

SOLUTION:
The Republic of Moldova first participated at the Olympic Games as an independent nation in 1994 , and has sent athletes to compete in every Games since then .