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Many people claim that television is a powerful educational tool.

From this statement we know that they
agree
with the existence of television.
Discussion:
Some people think that the years before the 
invention of television were a better time. They claim that families talked more and did more things together. More books were read. People used their imaginations more fully. People got more outdoor exercises.But others disagree. They claim that television is 
a powerful educational tool.