Assertion: sarin's use | /r/HasProperty | difficult to prove
Facets:
value: extremely
type: DEGREE
Source sentences:
text: The use of sarin is extremely difficult to prove, said Charles Blair, a terrorism expert at the Federation of American Scientists and a columnist for the Bulletin of the Atomic Scientists.
text: The use of sarin is extremely difficult to prove, said Charles Blair, a terrorism expert at the Federation of American Scientists and a columnist for the Bulletin of the Atomic Scientists.