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.

[Q]: Machaut wrote a mass known as " Messe de Nostre Dame " .
[A]: Machaut wrote the " Messe de Nostre Dame " , the earliest known complete setting of the Ordinary of the Mass attributable to a single composer .


[Q]: Istituto Nazionale di Statistica is the national statistical institute of Italy .
[A]: The Italian National Institute of Statistics ( Italian : Istituto Nazionale di Statistica ; Istat ) is the main producer of official statistics in Italy .


[Q]: The Convention also says that any toxic chemical is a chemical weapon unless it is used for legal reasons .
[A]:
Under this Convention , any toxic chemical , regardless of its origin , is considered a chemical weapon unless it is used for purposes that are not prohibited ( an important legal definition known as the General Purpose Criterion ) .