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In symbolic computation (or computer algebra), at the intersection of mathematics and computer science, the Risch algorithm is an algorithm for indefinite integration. It is used in some computer algebra systems to find antiderivatives. It is named after the American mathematician Robert Henry Risch, a specialist in computer algebra who developed it in 1968.

Sentence: Before the Risch algorithm computers had a hard time finding antiderivatives.

Output: It's impossible to say

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This is a list of episodes of the British television situation comedy "Lead Balloon". The first series of six episodes aired in 2006 and a second series, extended to eight episodes, aired in 2007. The third series began in November 2008. All episodes are written by Jack Dee and Pete Sinclair, and are directed and produced by Alex Hardcastle.

Sentence: Jack Dee and Pete Sinclair were roommates in college.

Output: It's impossible to say

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Evolution: A Theory in Crisis is a 1985 book by Michael Denton arguing that the scientific theory of evolution by natural selection is a "theory in crisis". Reviews by scientists say that the book distorts and misrepresents evolutionary theory and contains numerous errors.

Sentence: The scientists who reviewed the book have reviewed many books since

Output: It's impossible to say

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Ron Hutchinson (born near Lisburn, County Antrim, Northern Ireland) is an Emmy Award winning screenwriter and an Olivier Award nominated playwright, known for writing John Frankenheimer's "Against the Wall", Robert M. Young's "Slave of Dreams", John Frankenheimer's "The Island of Dr. Moreau", "Moonlight and Magnolias" (play), and the 2004 miniseries "Traffic."

Sentence: Ron Hutchinson was nominated for many different awards.

Output:
It's impossible to say